Fix --debug option to default to gdb

When --debug is specified, pick up the default value for
--debug-command of 'gdb --args' correctly.

svn path=/trunk/; revision=20

scripts/launcher.py

@@ -71,7 +71,7 @@ class Launcher:
             env['GJS_DEBUG_TOPICS'] = 'JS LOG'
 
         if self.options.debug:
-            args = list(self.options.debug_command)
+            args = list(self.debug_command)
         else:
             args = []