Give Xidorn reviewer privileges.

He has been doing a bunch of reviews and triaging both in Servo and in Bindgen,
and I'm tired of landing the patches he reviews ;).

homu/files/cfg.toml

@@ -200,6 +200,7 @@ secret = "{{ pillar["homu"]["web-secret"] }}"
     "saneyuki",
     "SimonSapin",
     "shinglyu",
+    "upsuper",
     "Wafflespeanut",
     "zmike",
 ] %}
@@ -222,7 +223,6 @@ secret = "{{ pillar["homu"]["web-secret"] }}"
     "paulrouget",
     "stshine",
     "tschneidereit",
-    "upsuper",
     "vvuk",
     "Yoric",
 ] %}