Fix peer app info request before on-boarding

The MainActivity continued its execution of onCreate even after calling
finish, causing a call to initPeerAppInfo and subsequent getCallingPackage
to fail because the calling activity was already finished

app/src/main/java/com/emanuelef/remote_capture/activities/MainActivity.java

@@ -146,10 +146,11 @@ protected void onCreate(Bundle savedInstanceState) {
         int appver = Prefs.getAppVersion(mPrefs);
         if(appver <= 0) {
             // First run, start on-boarding
+            // only refresh app version on on-boarding done
             Intent intent = new Intent(MainActivity.this, OnBoardingActivity.class);
             startActivity(intent);
             finish();
-            // only refresh app version on on-boarding done
+            return;
         } else
             Prefs.refreshAppVersion(mPrefs);