bug/#1193 - slight fix

Impacted class:
* `MapTileProviderBasic`: replaced an `.equals(Object)` with a `==`

osmdroid-android/src/main/java/org/osmdroid/tileprovider/MapTileProviderBasic.java

@@ -200,7 +200,7 @@ public boolean setOfflineFirst(final boolean pOfflineFirst) {
 			if (downloaderIndex == -1 && provider == mDownloaderProvider) {
 				downloaderIndex = i;
 			}
-			if (approximationIndex == -1 && mApproximationProvider.equals(provider)) {
+			if (approximationIndex == -1 && provider == mApproximationProvider) {
 				approximationIndex = i;
 			}
 			i++;