write_metadata fixes

fdroidserver/checkupdates.py

@@ -506,7 +506,7 @@ def checkupdates_app(app, first=True):
     if commitmsg:
         metadatapath = os.path.join('metadata', app['id'] + '.txt')
         with open(metadatapath, 'w') as f:
-            metadata.write_metadata(f, app)
+            metadata.write_metadata('txt', f, app)
         if options.commit:
             logging.info("Commiting update for " + metadatapath)
             gitcmd = ["git", "commit", "-m", commitmsg]

fdroidserver/import.py

@@ -249,7 +249,7 @@ def main():
 
     metadatapath = os.path.join('metadata', package + '.txt')
     with open(metadatapath, 'w') as f:
-        metadata.write_metadata(f, app)
+        metadata.write_metadata('txt', f, app)
     logging.info("Wrote " + metadatapath)