Fix unit tests by updating fixtures and updating outdated test

Signed-off-by: Jonas Franz <info@jonasfranz.software>

models/fixtures/comment.yml

@@ -30,6 +30,7 @@
   line: 4
   tree_path: "README.md"
   created_unix: 946684812
+  invalidated: false
 -
   id: 5
   type: 19 # code comment
@@ -39,3 +40,4 @@
   line: -4
   tree_path: "README.md"
   created_unix: 946684812
+  invalidated: false

models/issue_comment_test.go

@@ -55,5 +55,5 @@ func TestFetchCodeComments(t *testing.T) {
 	user2 := AssertExistsAndLoadBean(t, &User{ID: 2}).(*User)
 	res, err = FetchCodeComments(issue, user2)
 	assert.NoError(t, err)
-	assert.Empty(t, res)
+	assert.Len(t, res, 1)
 }