Fix the tab text in the multi-branch Pipeline detail page

Created by: LinuxSuRen

What would you like to be added:

The expression of Branch and PullRequest is incorrect. Please see the following screenshot:

Why is this needed:

This issue is friendly for the new contributors. Please don't hurry to fix this before we get started to release the next version of KubeSphere.

/area devops /project devops /help /priority