Improve selection of iOS device in mobile example (bevyengine#9282)

# Objective

- Make sure that users can "just run" the mobile example
- Device descriptions like `iPhone SE (3rd generation)
(F647334F-D7C1-4BD6-9B5F-0E3D9713C02B) (Shutdown)` currently fail
([issue
found](NiklasEi/bevy_game_template#61 (comment))
by @CleanCut)

## Solution

- Improve the script that grabs the device UUID from the device list

examples/mobile/Makefile

@@ -2,7 +2,7 @@
 
 DEVICE = ${DEVICE_ID}
 ifndef DEVICE_ID
-	DEVICE=$(shell xcrun simctl list devices 'iOS' | grep -v 'unavailable' | grep -v '^--' | grep -v '==' | head -n 1 | cut -d ' ' -f 7 | sed 's/[()]//g')
+	DEVICE=$(shell xcrun simctl list devices 'iOS' | grep -v 'unavailable' | grep -v '^--' | grep -v '==' | head -n 1 | grep -E -o -i "([0-9a-f]{8}-([0-9a-f]{4}-){3}[0-9a-f]{12})")
 endif
 
 run: install