tool_getparam: let --trace-config override -v

tool_getparam: let --trace-config override -v

If --trace-config is used to set a level before -v is used, don't reset
the state on first -v (to "-all") as it otherwise does. This way,
--trace-config can be used to set specific trace items before -v on the
command line and it still works.

Previously, the first -v use would otherwise reset and undo the earlier
--trace-config items.

Fixes #18346