Activate terminal button when a terminal is focus

This is code I brought over from https://github.com/zed-industries/zed/pull/2267 by @mikayla-maki after fixing the conflicts.

Co-Authored-By: Mikayla Maki <mikayla.c.maki@gmail.com>
8440a98850Petros Amoiridis committed on 3/11/2023, 2:45:28 PMparentbccc34c
1 file changedLine totals unavailable