gitk: Fix selection of tags

When a tag is clicked an error is raised due to a missing parameter in
a function call.

Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/gitk b/gitk
index 4e2be7f..364c7a8 100755
--- a/gitk
+++ b/gitk
@@ -10489,7 +10489,7 @@
 	set text "[mc "Tag"]: $tag\n[mc "Id"]:  $tagids($tag)"
     }
     appendwithlinks $text {}
-    maybe_scroll_ctext
+    maybe_scroll_ctext 1
     $ctext conf -state disabled
     init_flist {}
 }