fix wallpaper script blocked by matugen interaction

https://github.com/InioX/matugen/issues/255

dots/.config/quickshell/ii/scripts/colors/switchwall.sh

@@ -175,8 +175,10 @@ switch() {
     cursorposy=$(bc <<< "scale=0; ($cursorposy - $screeny) * $scale / 1")
     cursorposy_inverted=$((screensizey - cursorposy))
 
+    matugen_args=(--source-color-index 0)
+
     if [[ "$color_flag" == "1" ]]; then
-        matugen_args=(color hex "$color")
+        matugen_args+=(color hex "$color")
         generate_colors_material_args=(--color "$color")
     else
         if [[ -z "$imgpath" ]]; then
@@ -234,7 +236,7 @@ switch() {
             set_thumbnail_path "$thumbnail"
 
             if [ -f "$thumbnail" ]; then
-                matugen_args=(image "$thumbnail")
+                matugen_args+=(image "$thumbnail")
                 generate_colors_material_args=(--path "$thumbnail")
                 create_restore_script "$video_path"
             else
@@ -243,7 +245,7 @@ switch() {
                 exit 1
             fi
         else
-            matugen_args=(image "$imgpath")
+            matugen_args+=(image "$imgpath")
             generate_colors_material_args=(--path "$imgpath")
             # Update wallpaper path in config
             set_wallpaper_path "$imgpath"