[gedit] Fixes #163.Command_tag does not exists, use error_tag instead

[Jordi Mas <jmas src gnome org>]

commit 02e21429fe4c3b1a987795216b78fe042f166db4
Author: Jordi Mas <jmas softcatala org>
Date:   Wed Apr 24 07:06:20 2019 +0200

    Fixes #163.Command_tag does not exists, use error_tag instead

 plugins/externaltools/tools/functions.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/plugins/externaltools/tools/functions.py b/plugins/externaltools/tools/functions.py
index 1f8f65e72..36511eec6 100644
--- a/plugins/externaltools/tools/functions.py
+++ b/plugins/externaltools/tools/functions.py
@@ -189,7 +189,7 @@ def run_external_tool(window, panel, node):
             end = start.copy()
             if not start.inside_word():
                 panel.write(_('You must be inside a word to run this command'),
-                            panel.command_tag)
+                            panel.error_tag)
                 return
             if not start.starts_word():
                 start.backward_word_start()