test(19.4-04): one sm-user-plugin test name per line in the gate

scripts/check-phase19.4.sh

@@ -103,7 +103,9 @@ PLUGIN_TESTS=(
 
 # userplugin stage: the user plugin's Docker-free suites (-short), by
 # package pattern relative to the application workspace.
-USER_ROOT_TESTS=(TestEndRequestSession)
+USER_ROOT_TESTS=(
+	TestEndRequestSession
+)
 
 # fonoteka stage: the application's Docker-free OAuth suites (-short).
 APP_OAUTH_TESTS=(
@@ -132,7 +134,11 @@ DOCKER_PLUGIN_TESTS=(
 	TestKeyRingMultiInstanceRace TestKeyRingPreviousAppKey TestMCPStore
 	TestImportWinter TestImportKeyDirErrors TestRotateKeysCommand
 )
-DOCKER_USER_ROOT_TESTS=(TestRequestUser TestAvatarURL TestDeactivatingEvent)
+DOCKER_USER_ROOT_TESTS=(
+	TestRequestUser
+	TestAvatarURL
+	TestDeactivatingEvent
+)
 # The application's OAuth suites on Postgres (D-09), the explicit resource
 # of plan 01 included.
 DOCKER_APP_OAUTH_TESTS=(