Fix windowing detection echoing last module error if none matched

Display a more general message in the debug buffer.

rc/windowing/detection.kak

@@ -31,11 +31,11 @@ hook -group windowing global KakBegin .* %{
         set -- ${kak_opt_windowing_modules}
         if [ $# -gt 0 ]; then
             echo 'try %{ '
-            while [ $# -gt 1 ]; do
+            while [ $# -ge 1 ]; do
                 echo "require-module ${1} } catch %{ "
                 shift
             done
-            echo "require-module ${1} }"
+            echo "echo -debug 'no windowing module detected' }"
         fi
     }
 }