px_romfs_pruner.py: ignore files starting with .

Tools/px_romfs_pruner.py

@@ -57,7 +57,8 @@ def main():
         for (root, dirs, files) in os.walk(args.folder):
                 for file in files:
                         # only prune text files
-                        if ".zip" in file or ".bin" in file or ".swp" in file or ".data" in file or ".DS_Store" in file:
+                        if ".zip" in file or ".bin" in file or ".swp" in file or ".data" in file or \
+                                        ".DS_Store" in file or file.startswith("."):
                                 continue
 
                         file_path = os.path.join(root, file)