full-text search doesn't work in fields with branches while editing pull request

[lakostin]

• Gitea version (or commit ref):
  1.14.0+dev-534-gedbc5c86d
• Git version:
  2.26.2
• Operating system:
  docker Alpine Linux v3.12
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
• Log gist:

Description

If i want to change target or source branch in already created pull request, i have to write the name of new branch starting from organization. If i type just branch name it won't be found.
...

Screenshots