fix: add missing whitespace in shuffle menu entry for spotify waybar module (#877)

Author: zeerayne

Configs/.local/share/waybar/modules/custom-spotify.jsonc

@@ -16,7 +16,7 @@
       "next": "playerctl next --player spotify",
       "previous": "playerctl previous --player spotify",
       "stop": "playerctl stop --player spotify",
-      "shuffle": "playerctl shuffle toggle--player spotify",
+      "shuffle": "playerctl shuffle toggle --player spotify",
       "repeat": "playerctl loop Track --player spotify",
       "loop": "playerctl loop Playlist --player spotify",
       "disable-loop": "playerctl loop None --player spotify",