jsonrpc: Test application error responses again
jsonrpc: Test application error responses again

The test was modified to not fail after a refactoring, making it not test what
it was intended to test at all. This reverts the changes and updates the test
in another way, keeping the original intention.

pacificIT/mopidy,dbrgn/mopidy,pacificIT/mopidy,hkariti/mopidy,mopidy/mopidy,adamcik/mopidy,ali/mopidy,bacontext/mopidy,woutervanwijk/mopidy,jmarsik/mopidy,hkariti/mopidy,tkem/mopidy,hkariti/mopidy,jodal/mopidy,glogiotatidis/mopidy,SuperStarPL/mopidy,liamw9534/mopidy,glogiotatidis/mopidy,jmarsik/mopidy,quartz55/mopidy,jcass77/mopidy,jmarsik/mopidy,swak/mopidy,bacontext/mopidy,SuperStarPL/mopidy,pacificIT/mopidy,vrs01/mopidy,mopidy/mopidy,mopidy/mopidy,liamw9534/mopidy,SuperStarPL/mopidy,jodal/mopidy,swak/mopidy,hkariti/mopidy,dbrgn/mopidy,priestd09/mopidy,SuperStarPL/mopidy,bencevans/mopidy,diandiankan/mopidy,adamcik/mopidy,swak/mopidy,ZenithDK/mopidy,diandiankan/mopidy,tkem/mopidy,mokieyue/mopidy,bacontext/mopidy,rawdlite/mopidy,bacontext/mopidy,dbrgn/mopidy,ZenithDK/mopidy,pacificIT/mopidy,mokieyue/mopidy,diandiankan/mopidy,tkem/mopidy,jcass77/mopidy,woutervanwijk/mopidy,adamcik/mopidy,ali/mopidy,glogiotatidis/mopidy,mokieyue/mopidy,priestd09/mopidy,rawdlite/mopidy,tkem/mopidy,glogiotatidis/mopidy,kingosticks/mopidy,bencevans/mopidy,jcass77/mopidy,swak/mopidy,abarisain/mopidy,jmarsik/mopidy,vrs01/mopidy,vrs01/mopidy,ali/mopidy,quartz55/mopidy,abarisain/mopidy,bencevans/mopidy,bencevans/mopidy,vrs01/mopidy,quartz55/mopidy,rawdlite/mopidy,dbrgn/mopidy,priestd09/mopidy,diandiankan/mopidy,ZenithDK/mopidy,rawdlite/mopidy,quartz55/mopidy,mokieyue/mopidy,kingosticks/mopidy,jodal/mopidy,ali/mopidy,kingosticks/mopidy,ZenithDK/mopidy