[uwb] Fix stop-all-ranging-sessions shell command

Bug was due to `.keySet()` holding references to the underlying `sSessionIdToInfo`, which was getting modified during iteration. Copying the `Set` into a list fixes the issue.

Bug: 316976959
Test: Manual test with adb shell:
  adb shell cmd uwb start-fira-ranging-session -i 1
  adb shell cmd uwb start-fira-ranging-session -i 2
  adb shell cmd uwb start-fira-ranging-session -i 3
  adb shell cmd uwb stop-all-ranging-sessions
Test: atest ServiceUwbTests
Change-Id: Ic68086bb55b672673864fa0a7e0c915a173c28ef
1 file changed