fix syntax error in bash script

Author: cb-ekuersch

.github/workflows/visreg-mobile.yml

@@ -157,9 +157,7 @@ jobs:
 
             # sys.boot_completed=1 fires before all services are ready; wait for
             # the package manager specifically before attempting install.
-            until adb shell pm list packages > /dev/null 2>&1; do
-              echo "Waiting for package manager..."; sleep 1
-            done
+            while ! adb shell pm list packages > /dev/null 2>&1; do echo "Waiting for package manager..."; sleep 1; done
 
             adb install -r apps/mobile-app/prebuilds/android-release-hermes/binary.apk