Hotfix to main build_loop.yml

I found a typo in the build_loop.yml file in which the upstream repository could be synced to itself.

I am modifying this file for the main branch to see if it makes a difference to build actions for forks of LoopWorkspace.

The original redesign for the build action was done in the LoopFollow repository (owner loopandlearn) and when the redesign was implemented for LoopWorkspace (owner LoopKit), the line that skips the sync based on repository owner was inadvertently modified to loopandlearn.

There is no change to the function of the code, so I do not plan to modify the version number; leaving it at v3.8.2.