Android: don't try to pause emulation when not running

Forcing landscape at emulation start revealed a bug where if the activity was
recreated before emulation started then it would get stuck in a paused state.

Original commit by zackhow for Dolphin-emu.

src/android/app/src/main/java/org/citra/citra_emu/fragments/EmulationFragment.java

@@ -127,7 +127,8 @@ public final class EmulationFragment extends Fragment implements SurfaceHolder.C
             directoryStateReceiver = null;
         }
 
-        mEmulationState.pause();
+        if (mEmulationState.isRunning())
+            mEmulationState.pause();
         super.onPause();
     }