Restrict search EditText to single line (including hint).
Restrict search EditText to single line (including hint).

On some smaller devices, the hint text ("Search Wikipedia Zero") overflows
into two lines, even though "singleLine" is set to true.

Change-Id: Id5d4a71a5405a80e0f26456744412fc22e535cdb

SAGROUP2/apps-android-wikipedia,creaITve/apps-android-tbrc-works,wikimedia/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,anirudh24seven/apps-android-wikipedia,reproio/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,creaITve/apps-android-tbrc-works,wikimedia/apps-android-wikipedia,reproio/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,BrunoMRodrigues/apps-android-tbrc-work,Duct-and-rice/KrswtkhrWiki4Android,anirudh24seven/apps-android-wikipedia,reproio/apps-android-wikipedia,Wikinaut/wikipedia-app,parvez3019/apps-android-wikipedia,wikimedia/apps-android-wikipedia,Wikinaut/wikipedia-app,wikimedia/apps-android-wikipedia,parvez3019/apps-android-wikipedia,carloshwa/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,creaITve/apps-android-tbrc-works,anirudh24seven/apps-android-wikipedia,BrunoMRodrigues/apps-android-tbrc-work,Duct-and-rice/KrswtkhrWiki4Android,Wikinaut/wikipedia-app,BrunoMRodrigues/apps-android-tbrc-work,dbrant/apps-android-wikipedia,parvez3019/apps-android-wikipedia,dbrant/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,carloshwa/apps-android-wikipedia,parvez3019/apps-android-wikipedia,carloshwa/apps-android-wikipedia,dbrant/apps-android-wikipedia,reproio/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,Wikinaut/wikipedia-app,BrunoMRodrigues/apps-android-tbrc-work,Wikinaut/wikipedia-app,Duct-and-rice/KrswtkhrWiki4Android,reproio/apps-android-wikipedia,dbrant/apps-android-wikipedia,creaITve/apps-android-tbrc-works,carloshwa/apps-android-wikipedia,carloshwa/apps-android-wikipedia,dbrant/apps-android-wikipedia,parvez3019/apps-android-wikipedia