fix gdaltools error checking for ogr layers

Author: brushtyler

python/plugins/GdalTools/tools/GdalTools_utils.py

@@ -153,7 +153,7 @@ def getRasterLayers(self):
     def isVector(self, layer):
       if layer.type() != layer.VectorLayer:
         return False
-      if layer.usesProvider() and layer.providerKey() != 'ogr':
+      if layer.providerType() != 'ogr':
         return False
       return True