Before #4183 a builtin plugin was *defautlt_on* when it is listed in the
"enabled_plugins" settings, this patch restores the previous behavior.
Not part of this patch but just to mentioning in context of #4263:
In the long term, we will abolish the "enabled_plugins:" setting and combine
all options for the plugins in the "plugins:" setting, as is already planned
in the PR #4282
Closes: https://github.com/searxng/searxng/issues/4263
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
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