Drop unnecessary "x" comparison hack

Those used to be needed wayyyy back with some broken shells.

dotfiles/config/i3/bin/i3staplus

@@ -142,7 +142,7 @@ m_sprintn() {
         "$sprintn" "$color"
 }
 
-if test "x$I3STAPLUS__LOG" = "xtrue"; then
+if test "$I3STAPLUS__LOG" = "true"; then
     mkdir -p "$I3STAPLUS__LOGDIR"
     log_pre() {
         tee "$I3STAPLUS__LOGDIR/debug-pre.json"