Fix commons-app#4992 invert the equals condition to be null safe

Author: madhurgupta10

app/src/main/java/fr/free/nrw/commons/LocationPicker/LocationPickerActivity.java

@@ -155,7 +155,7 @@ protected void onCreate(@Nullable final Bundle savedInstanceState) {
         addCredits();
         getToolbarUI();
 
-        if (activity.equals("UploadActivity")) {
+        if ("UploadActivity".equals(activity)) {
             placeSelectedButton.setVisibility(View.GONE);
             modifyLocationButton.setVisibility(View.VISIBLE);
             showInMapButton.setVisibility(View.VISIBLE);