Fix an issue with double forward slashes in res paths (#1703)

scripts/icons_update.py

@@ -141,6 +141,7 @@ def get_icon_file(res_path, size):
     icon for it. Return as PIL image object down-
     scaled for use in pyfa.
     """
+    res_path = res_path.replace('//', '/')  #1703
     if res_path not in res_index:
         return None
     res_icon = res_index[res_path]