rofi: Show window on focused monitor

This makes rofi work nicely with multi-monitor setups, however I was
planning to remove rofi since I can do everything that rofi can do with
a simple shell, and without having to worry about its inconveniences,
such as unreadable default wal color themes.

rofi/.config/rofi/launch.sh

@@ -59,4 +59,5 @@ env \
   XCURSOR_SIZE="$CURSOR_SIZE" \
   rofi \
     -show drun \
-    -dpi "$ROFI_DPI"
+    -dpi "$ROFI_DPI" \
+    -m -1