Use launchMode=singleTask so that settings/info stay in same task  (#251)
Use launchMode=singleTask so that settings/info stay in same task
 (#251)

If we use singleInstance, then any new activities are launched in a new
task. I.e. Settings/About/Help/Rights are launched in a new task, if you
then switch apps and return to focus, then exit the Settings/About/Help/
Rights activities, you return to the home screen since the MainActivity
isn't in the same task/backstack.

mastizada/focus-android,pocmo/focus-android,jonalmeida/focus-android,liuche/focus-android,jonalmeida/focus-android,liuche/focus-android,ekager/focus-android,mozilla-mobile/focus-android,layely/focus-android,Achintya999/focus-android,ekager/focus-android,codebu5ter/focus-android,liuche/focus-android,mastizada/focus-android,pocmo/focus-android,pocmo/focus-android,pocmo/focus-android,ekager/focus-android,liuche/focus-android,mastizada/focus-android,ekager/focus-android,Benestar/focus-android,ekager/focus-android,jonalmeida/focus-android,Benestar/focus-android,mozilla-mobile/focus-android,Benestar/focus-android,layely/focus-android,mozilla-mobile/focus-android,mozilla-mobile/focus-android,pocmo/focus-android,Benestar/focus-android,mozilla-mobile/focus-android,Benestar/focus-android,liuche/focus-android,ekager/focus-android,Achintya999/focus-android,jonalmeida/focus-android,codebu5ter/focus-android,mastizada/focus-android,Achintya999/focus-android,Achintya999/focus-android,codebu5ter/focus-android,mastizada/focus-android,jonalmeida/focus-android,jonalmeida/focus-android,layely/focus-android,layely/focus-android,mozilla-mobile/focus-android,layely/focus-android,liuche/focus-android,codebu5ter/focus-android,pocmo/focus-android