Revert change to StatusContentType swagger annotation

I'm going to include this in a follow-on PR instead.

docs/api/swagger.yaml

@@ -2993,19 +2993,6 @@ definitions:
                 example: <p>Hey this is a status!</p>
                 type: string
                 x-go-name: Content
-            content_type:
-                description: |-
-                    Content type that was used to parse this revision's text.
-                    text/plain StatusContentTypePlain
-                    text/markdown StatusContentTypeMarkdown
-                enum:
-                    - text/plain
-                    - text/markdown
-                type: string
-                x-go-enum-desc: |-
-                    text/plain StatusContentTypePlain
-                    text/markdown StatusContentTypeMarkdown
-                x-go-name: ContentType
             created_at:
                 description: The date when this revision was created (ISO 8601 Datetime).
                 example: "2021-07-30T09:20:25+00:00"
@@ -3200,17 +3187,8 @@ definitions:
             status as submitted to the API when it was created.
         properties:
             content_type:
-                description: |-
-                    Content type that was used to parse the text.
-                    text/plain StatusContentTypePlain
-                    text/markdown StatusContentTypeMarkdown
-                enum:
-                    - text/plain
-                    - text/markdown
+                description: Content type that was used to parse the text.
                 type: string
-                x-go-enum-desc: |-
-                    text/plain StatusContentTypePlain
-                    text/markdown StatusContentTypeMarkdown
                 x-go-name: ContentType
             id:
                 description: ID of the status.

internal/api/model/status.go

@@ -293,7 +293,8 @@ const (
 // StatusContentType is the content type with which to parse the submitted status.
 // Can be either text/plain or text/markdown. Empty will default to text/plain.
 //
-// swagger:enum StatusContentType
+// swagger:enum statusContentType
+// swagger:type string
 type StatusContentType string
 
 // Content type to use when parsing submitted