Clear issue branch/tag during issue creation

[FWDekker]

• Gitea version (or commit ref): 1.10.0
• Git version: 2.23.0
• Operating system: FreeBSD
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
  • Not relevant
• Log gist: N/A

Description

While in the process of creating an issue, it's possible to select a branch/tag. However, it is not possible to remove this branch/tag before actually creating the issue. I think there should be a "clear" button in case I change my mind before submitting the issue. Without this button I would have to refresh the page and re-enter all fields, which is bothersome.

Screenshots

[guillep2k]

This will be fixed by #9080.

[lunny]

duplicated with #3620