filters: append well known dirs to exec PATH

To allow referencing built-in filters without hard coding a path during
installation, append the following folders to the exec PATH when running
the filter commands:

	~/.config/aerc/filters
	~/.local/share/aerc/filters
	$PREFIX/share/aerc/filters
	/usr/share/aerc/filters

If a filter script has the same name than a command in the default exec
PATH, it will not shadow it. In that edge case, the absolute path to the
filter script must be specified.

Suggested-by: Teo Luppi <me@luppi.uk>
Signed-off-by: Robin Jarry <robin@jarry.cc>
Acked-by: Moritz Poldrack <moritz@poldrack.dev>

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