Do not use VIQR input method for vi locale by default

In the Vietnamese Quoted-Readable input method, punctuation following a
base letter is converted into diacritical marks, for example a( → ă.
(See <https://en.wikipedia.org/wiki/Vietnamese_Quoted-Readable>.)
A 2008 bug report in Ubuntu argued that this is a problematic default,
particularly when typing passwords, where the effect of the punctuation
is non-obvious.

According to the bug reporter, VIQR is popular with Vietnamese users
living elsewhere in the world, where Vietnamese keyboards are unlikely
to be readily available, but is not a popular choice within Vietnam,
where the Telex or VNI input modes are preferred.

Closes: #183

Bug-Debian: https://bugs.debian.org/895043
Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/gtk+2.0/+bug/191451

Signed-off-by: Emmanuele Bassi <ebassi@gnome.org>

modules/input/imviqr.c

@@ -242,7 +242,7 @@ static const GtkIMContextInfo viqr_info = {
   NC_("input method menu", "Vietnamese (VIQR)"), /* Human readable name */
   GETTEXT_PACKAGE,	   /* Translation domain */
    GTK_LOCALEDIR,	   /* Dir for bindtextdomain (not strictly needed for "gtk+") */
-  "vi"			   /* Languages for which this module is the default */
+  ""			   /* Languages for which this module is the default */
 };
 
 static const GtkIMContextInfo *info_list[] = {