Make pending commit status yellow again (#25935)

Make pending commit status yellow again (#25935)

With the introduction of Actions, the pending commit icon has changed
from yellow to grey for Drone integrations which never set the "running"
status, so it stays in "pending" until completion.

I find it better to have this icon colored like on 1.19. Now both the
"pending" and "running" icons look the same, but I guess we could add an
animation to the "running" state similar to GitHub has to it later.

Before:
<img width="339" alt="Screenshot 2023-07-17 at 19 14 19"
src="https://github.com/go-gitea/gitea/assets/115237/2f4886e4-74fd-42ea-b59e-9af8f141bf1f">

After:
<img width="335" alt="Screenshot 2023-07-17 at 19 14 30"
src="https://github.com/go-gitea/gitea/assets/115237/53189642-e72d-47f6-9cbe-f14eda28f730">

Also, it matches GH's icon:

<img width="466" alt="image"
src="https://github.com/go-gitea/gitea/assets/115237/5804ff90-d223-4a3c-8093-7a9abbaacf87">

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Co-authored-by: delvh <dev.lh@web.de>