src/tests: Fix some tests

- Delete ua(rstu) in org.freedesktop.ibus.gschema.xml
ua(rstu) has been available in xkeyboard-config 2.38 but deleted
in 2.39.

- Use command -v rather than which in runtest

Fixes: https://gitlab.freedesktop.org/xkeyboard-config/xkeyboard-config/-/commit/a9f7e47

BUG=#2542
BUG=#2544

data/dconf/org.freedesktop.ibus.gschema.xml

@@ -74,8 +74,8 @@
         'ru(xal)', 'se(rus)', 'se(rus_nodeadkeys)', 'se(swl)', 'sy',
         'sy(syc)', 'sy(syc_phonetic)', 'th', 'th(pat)', 'th(tis)',
         'tj', 'tj(legacy)', 'tz', 'ua', 'ua(homophonic)',
-        'ua(legacy)', 'ua(phonetic)', 'ua(rstu)', 'ua(rstu_ru)',
-        'ua(typewriter)', 'ua(winkeys)', 'us(chr)', 'us(rus)', 'uz' ]
+        'ua(legacy)', 'ua(phonetic)', 'ua(typewriter)', 'ua(winkeys)',
+        'us(chr)', 'us(rus)', 'uz' ]
       </default>
       <summary>Latin layouts which have no ASCII</summary>
       <description>US layout is appended to the Latin layouts. variant can be omitted.</description>

src/tests/runtest

@@ -44,8 +44,7 @@ MACHINE=`uname -m`
 if test x"$MACHINE" = xx86_64 ; then
     GTK_QUERY_MODULE=gtk-query-immodules-3.0-64
 fi
-which $GTK_QUERY_MODULE
-if [ $? -ne 0 ] ; then
+if ! command -v $GTK_QUERY_MODULE &> /dev/null ; then
     GTK_QUERY_MODULE=gtk-query-immodules-3.0
 fi