Remove unnecessary error printed in logs

Change from logging.error to debug.
Reported by - Shaan Subbaiah <shaansubbaiah.cs18@bmsce.ac.in>
-- 1593854307.251860 ERROR root: tempfile is /home/user/.sugar/default/org.laptop.AbiWordActivity/instance/tmpmfc6g_tc.png

toolbar.py

@@ -153,7 +153,7 @@ def __paste_button_cb(self, button):
                 os.makedirs(temp_path)
             fd, file_path = tempfile.mkstemp(dir=temp_path, suffix='.png')
             os.close(fd)
-            logging.error('tempfile is %s' % file_path)
+            logging.debug('tempfile is %s' % file_path)
             success, data = pixbuf_sel.save_to_bufferv('png', [], [])
             if success:
                 px_file = open(file_path, 'wb')