Toggle the extra keys view with VolumeUp+K

Using K as a shortcut for toggling extra Keyboard probably makes more
sense than VolumeUp+Q, although we support both for now.

app/src/main/java/com/termux/app/TermuxViewClient.java

@@ -210,6 +210,7 @@ public final class TermuxViewClient implements TerminalViewClient {
 
                 // Writing mode:
                 case 'q':
+                case 'k':
                     mActivity.toggleShowExtraKeys();
                     break;
             }