Fix missing migration - satisfy linter

models/migrations/migrations.go

@@ -294,6 +294,8 @@ var migrations = []Migration{
 	NewMigration("Add sessions table for go-chi/session", addSessionTable),
 	// v173 -> v174
 	NewMigration("Add time_id column to Comment", addTimeIDCommentColumn),
+	// v174 -> v175
+	NewMigration("Add DefaultMergeStyle to pull requests", addPullRequestDefaultMergeStyle),
 }
 
 // GetCurrentDBVersion returns the current db version