Update the tile list right away if the image is replaced.

--HG--
branch : gsoc2014-dfighter

code/studio/src/plugins/tile_editor/tile_editor_main_window.cpp

@@ -827,6 +827,8 @@ void TileEditorMainWindow::onActionReplaceImage( int tabId )
 	QString fn = fileName.replace( '\\', '/' );
 	int slashIdx = fn.lastIndexOf( '/' );
 	m_lastTileDir = fn.left( slashIdx );
+
+	updateTab();
 }
 
 void TileEditorMainWindow::onTileBankLoaded()