gdb: some int to bool conversion in remote.c

Convert a couple of local variables from int to bool.  There should be
no user visible changes after this commit.

gdb/ChangeLog:

	* remote.c (check_pending_events_prevent_wildcard_vcont): Change
	argument type, update and re-wrap, header comment.
	(remote_target::commit_resumed): Convert any_process_wildcard and
	may_global_wildcard_vcont from int to bool.