[SPARK-19550] Follow-up: fixed a typo that fails the dev/make-distribution.sh script.
[SPARK-19550] Follow-up: fixed a typo that fails the dev/make-distribution.sh script.

## What changes were proposed in this pull request?

Fixed a typo in `dev/make-distribution.sh` script that sets the MAVEN_OPTS variable, introduced [here](https://github.com/apache/spark/commit/0e24054#diff-ba2c046d92a1d2b5b417788bfb5cb5f8R149).

## How was this patch tested?

Run `dev/make-distribution.sh` manually.

Author: Shuai Lin <linshuai2012@gmail.com>

Closes #16984 from lins05/fix-spark-make-distribution-after-removing-java7.

aosagie/spark,chuckchen/spark,sureshthalamati/spark,xuanyuanking/spark,jlopezmalla/spark,jiangxb1987/spark,hhbyyh/spark,adrian-ionescu/apache-spark,actuaryzhang/spark,narahari92/spark,chuckchen/spark,hhbyyh/spark,pgandhi999/spark,ajaysaini725/spark,setjet/spark,ajaysaini725/spark,apache-spark-on-k8s/spark,esi-mineset/spark,michalsenkyr/spark,rezasafi/spark,publicRoman/spark,SHASHANKB/spark,rekhajoshm/spark,xflin/spark,wangmiao1981/spark,sahilTakiar/spark,LantaoJin/spark,cloud-fan/spark,rekhajoshm/spark,debugger87/spark,publicRoman/spark,nilsgrabbert/spark,panfengfeng/spark,witgo/spark,tejasapatil/spark,nchammas/spark,JoshRosen/spark,loneknightpy/spark,srowen/spark,highfei2011/spark,vinodkc/spark,map222/spark,someorz/spark,tengpeng/spark,ioana-delaney/spark,ron8hu/spark,rezasafi/spark,zero323/spark,actuaryzhang/spark,tejasapatil/spark,shaneknapp/spark,guoxiaolongzte/spark,spark-test/spark,maropu/spark,jlopezmalla/spark,taroplus/spark,saturday-shi/spark,caneGuy/spark,ioana-delaney/spark,spark-test/spark,patrick-nicholson/spark,HyukjinKwon/spark,alunarbeach/spark,xflin/spark,SHASHANKB/spark,aosagie/spark,xflin/spark,markhamstra/spark,kevinyu98/spark,wzhfy/spark,mike0sv/spark,minixalpha/spark,mzl9039/spark,stanzhai/spark,akopich/spark,janewangfb/spark,eyalfa/spark,zuotingbing/spark,ueshin/apache-spark,WindCanDie/spark,janewangfb/spark,zzcclp/spark,janewangfb/spark,maropu/spark,ahnqirage/spark,zhouyejoe/spark,sureshthalamati/spark,techaddict/spark,jkbradley/spark,lxsmnv/spark,mdespriee/spark,liyichao/spark,BryanCutler/spark,ahnqirage/spark,eyalfa/spark,bravo-zhang/spark,zhouyejoe/spark,bdrillard/spark,ptkool/spark,stanzhai/spark,dbtsai/spark,jiangxb1987/spark,mzl9039/spark,shubhamchopra/spark,bravo-zhang/spark,bdrillard/spark,andrewor14/spark,narahari92/spark,srowen/spark,rednaxelafx/apache-spark,alunarbeach/spark,liutang123/spark,someorz/spark,liyichao/spark,holdenk/spark,UndeadBaneGitHub/spark,adrian-ionescu/apache-spark,taroplus/spark,publicRoman/spark,1haodian/spark,aokolnychyi/spark,jrshust/spark,WeichenXu123/spark,darionyaphet/spark,milliman/spark,ericvandenbergfb/spark,MLnick/spark,shaneknapp/spark,markhamstra/spark,witgo/spark,ioana-delaney/spark,wangyum/spark,1haodian/spark,zzcclp/spark,adrian-ionescu/apache-spark,hhbyyh/spark,BryanCutler/spark,mahak/spark,rednaxelafx/apache-spark,map222/spark,apache/spark,apache-spark-on-k8s/spark,mzl9039/spark,xflin/spark,minixalpha/spark,esi-mineset/spark,LantaoJin/spark,akopich/spark,akopich/spark,esi-mineset/spark,highfei2011/spark,aray/spark,bravo-zhang/spark,goldmedal/spark,xuanyuanking/spark,szhem/spark,nilsgrabbert/spark,gengliangwang/spark,nilsgrabbert/spark,liutang123/spark,bravo-zhang/spark,ddna1021/spark,holdenk/spark,someorz/spark,caneGuy/spark,ericvandenbergfb/spark,actuaryzhang/spark,witgo/spark,kevinyu98/spark,mzl9039/spark,jlopezmalla/spark,cloud-fan/spark,zhouyejoe/spark,srowen/spark,mahak/spark,aosagie/spark,jiangxb1987/spark,lxsmnv/spark,aray/spark,minixalpha/spark,MLnick/spark,loneknightpy/spark,pgandhi999/spark,debugger87/spark,JoshRosen/spark,debugger87/spark,tengpeng/spark,nlalevee/spark,chuckchen/spark,milliman/spark,ConeyLiu/spark,wangmiao1981/spark,lvdongr/spark,xuanyuanking/spark,JoshRosen/spark,spark-test/spark,chuckchen/spark,goldmedal/spark,rikima/spark,ron8hu/spark,aosagie/spark,liyichao/spark,ioana-delaney/spark,WindCanDie/spark,liutang123/spark,rednaxelafx/apache-spark,maropu/spark,WeichenXu123/spark,mdespriee/spark,jrshust/spark,janewangfb/spark,tejasapatil/spark,maropu/spark,tengpeng/spark,patrick-nicholson/spark,panfengfeng/spark,facaiy/spark,bravo-zhang/spark,kissmetrics/spark,wzhfy/spark,ron8hu/spark,tejasapatil/spark,sachintyagi22/spark,jianran/spark,eyalfa/spark,yanboliang/spark,xuanyuanking/spark,poffuomo/spark,aosagie/spark,jianran/spark,byakuinss/spark,tengpeng/spark,ConeyLiu/spark,vinodkc/spark,nlalevee/spark,sahilTakiar/spark,rikima/spark,apache/spark,cloud-fan/spark,nchammas/spark,guoxiaolongzte/spark,setjet/spark,map222/spark,highfei2011/spark,holdenk/spark,yanboliang/spark,zero323/spark,adrian-ionescu/apache-spark,goldmedal/spark,dongjoon-hyun/spark,sachintyagi22/spark,JoshRosen/spark,ioana-delaney/spark,debugger87/spark,map222/spark,adrian-ionescu/apache-spark,byakuinss/spark,wzhfy/spark,facaiy/spark,lxsmnv/spark,shaneknapp/spark,huang1900/spark,SHASHANKB/spark,ddna1021/spark,mzl9039/spark,debugger87/spark,ptkool/spark,1haodian/spark,poffuomo/spark,zuotingbing/spark,narahari92/spark,markhamstra/spark,adrian-ionescu/apache-spark,saltstar/spark,Aegeaner/spark,mzl9039/spark,caneGuy/spark,shubhamchopra/spark,hvanhovell/spark,ConeyLiu/spark,guoxiaolongzte/spark,byakuinss/spark,xflin/spark,zero323/spark,maropu/spark,dhruve/spark,ericvandenbergfb/spark,bOOm-X/spark,Aegeaner/spark,skonto/spark,panfengfeng/spark,loneknightpy/spark,matthewfranglen/spark,wangyum/spark,icexelloss/spark,shuangshuangwang/spark,joseph-torres/spark,kevinyu98/spark,lxsmnv/spark,bOOm-X/spark,ahnqirage/spark,maropu/spark,facaiy/spark,bOOm-X/spark,mahak/sp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