Add trust_level_1 to default chat_allowed_groups

By doing this, we will:

1. Have an open, but safe default
    People reach `@trust_level_1` pretty quickly, but `@trust_level_0` is still excluded by default, to limit new accounts joining and immediately spamming or otherwise abusing channe.s
2. Make it easier to change the default
    By keeping `@staff` in the default, we make it easy for admins to remove `@trust_level_1` and optionally add additional groups to their liking.

plugins/chat/config/settings.yml

@@ -6,7 +6,7 @@ plugins:
     client: true
     type: group_list
     list_type: compact
-    default: "3" # 3 is staff group id
+    default: "3|11" # 3: @staff, 11: @trust_level_1
     allow_any: false
     refresh: true
   needs_chat_seeded:
@@ -81,14 +81,14 @@ plugins:
     hidden: true
     client: true
   direct_message_enabled_groups:
-    default: "11" # auto group trust_level_1
+    default: "11" # @trust_level_1
     type: group_list
     client: true
     allow_any: false
     refresh: true
     validator: "DirectMessageEnabledGroupsValidator"
   chat_message_flag_allowed_groups:
-    default: "11" # auto group trust_level_1
+    default: "11" # @trust_level_1
     type: group_list
     client: true
     allow_any: false