Add 'default' to formally enforce the description

A quick follow up on #1265.

Signed-off-by: Alexey Rusakov <Alexey.Rusakov@pm.me>

api/client-server/content-repo.yaml

@@ -100,6 +100,7 @@ paths:
           name: allow_remote
           x-example: false
           required: false
+          default: true
           description: |
             Indicates to the server that it should not attempt to fetch the media if it is deemed
             remote. This is to prevent routing loops where the server contacts itself. Defaults to 
@@ -154,6 +155,7 @@ paths:
           name: allow_remote
           x-example: false
           required: false
+          default: true
           description: |
             Indicates to the server that it should not attempt to fetch the media if it is deemed
             remote. This is to prevent routing loops where the server contacts itself. Defaults to 
@@ -221,6 +223,7 @@ paths:
           name: allow_remote
           x-example: false
           required: false
+          default: true
           description: |
             Indicates to the server that it should not attempt to fetch the media if it is deemed
             remote. This is to prevent routing loops where the server contacts itself. Defaults to