fix(server_job): don't set job_count=0

I was seeing negative job counts. I think rejecting the promises is
enough

Author: cameronr

lua/opencode/server_job.lua

@@ -147,7 +147,6 @@ function M.cancel_all_requests()
   end
 
   M.requests = {}
-  state.job_count = 0
 end
 
 function M.ensure_server()