fix: declare variables as local in applescript

[ewanharris]

This avoids the modified time for the file being changed on each execution which triggers a beachball in Studio. The modified time would change as the variables were stored as globals and would persist each run

Fixes TIMOB-27102

Seeing as .scpt files are binary here's a viewable diff

sim_focus.scpt

on run argv
+	local simulator
+	local ext_display
+	local legacy
	if (count of argv) is greater than 0 then

sim_hide.scpt

on run argv
+	local simulator
+	local attempts
+	local visible
	if (count of argv) is 1 then

[sgtcoolguy]

LGTM