[BUG] Fix header name in swagger response

- This was incorrectly copied from the `swaggerCommitList` struct, which
on the other hand does set `X-Total`, but the API handler that uses this
response only sets `X-Total-Count`.

routers/api/v1/swagger/repo.go

@@ -263,7 +263,7 @@ type swaggerChangedFileList struct {
 	PerPage int `json:"X-PerPage"`
 
 	// Total commit count
-	Total int `json:"X-Total"`
+	Total int `json:"X-Total-Count"`
 
 	// Total number of pages
 	PageCount int `json:"X-PageCount"`

templates/swagger/v1_json.tmpl

@@ -24170,7 +24170,7 @@
           "format": "int64",
           "description": "Commits per page"
         },
-        "X-Total": {
+        "X-Total-Count": {
           "type": "integer",
           "format": "int64",
           "description": "Total commit count"