cmake: Do not hard-code test arguments

Tests should follow their default output of txt as when run directly,
and any output configuration should be handled by the CI system.

Change-Id: Id0d72318df5edad1c58ac637e827d6043884e829
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Toni Saario <toni.saario@qt.io>

cmake/QtTestHelpers.cmake

@@ -293,11 +293,6 @@ function(qt_internal_add_test name)
             endif()
             set(test_executable "${name}")
         endif()
-
-        if (NOT arg_CATCH)
-            #TODO: Should we replace this by TESTARGS environment variable?
-            list(APPEND extra_test_args "-o" "${name}.xml,xml" "-o" "-,txt")
-        endif()
     endif()
 
     qt_internal_collect_command_environment(test_env_path test_env_plugin_path)