Include Omarchy branch in About (#1231)

config/fastfetch/config.jsonc

@@ -68,6 +68,12 @@
       "keyColor": "blue",
       "text": "version=$(omarchy-version); echo \"Omarchy $version\""
     },
+    {
+      "type": "command",
+      "key": "│ ├󰘬",
+      "keyColor": "blue",
+      "text": "branch=$(omarchy-version-branch); echo \"$branch\""
+    },
     {
       "type": "kernel",
       "key": "│ ├",