Fix issue where the bottom portion of About screen was white in dark mode
Fix issue where the bottom portion of About screen was white in dark mode

The main change is setting layout_height of the ScrollView to match_parent.
Also added design time value for version text.

Change-Id: I89e06e2e06d0648752bfaa506ffed2b80d90b756

anirudh24seven/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,parvez3019/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,wikimedia/apps-android-wikipedia,reproio/apps-android-wikipedia,parvez3019/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,dbrant/apps-android-wikipedia,parvez3019/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,wikimedia/apps-android-wikipedia,wikimedia/apps-android-wikipedia,Wikinaut/wikipedia-app,carloshwa/apps-android-wikipedia,Wikinaut/wikipedia-app,dbrant/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,dbrant/apps-android-wikipedia,reproio/apps-android-wikipedia,parvez3019/apps-android-wikipedia,carloshwa/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,reproio/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,reproio/apps-android-wikipedia,carloshwa/apps-android-wikipedia,Wikinaut/wikipedia-app,Duct-and-rice/KrswtkhrWiki4Android,anirudh24seven/apps-android-wikipedia,Wikinaut/wikipedia-app,SAGROUP2/apps-android-wikipedia,Wikinaut/wikipedia-app,wikimedia/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,SAGROUP2/apps-android-wikipedia,dbrant/apps-android-wikipedia,carloshwa/apps-android-wikipedia,parvez3019/apps-android-wikipedia,dbrant/apps-android-wikipedia,reproio/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,carloshwa/apps-android-wikipedia