Instead of overwriting local variable to local hoodfile location,
copy it to the commonly used location. This makes the local hoodfile
behave exactly like central hoodfiles, which prevents some border cases.

The previous behaviour mainly caused issues when using getJsonPath() and
getUpgradePath() from fff-hoodutils.

Signed-off-by: Fabian Bläse <fabian@blaese.de>
Reviewed-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Robert Langhammer <rlanghammer@web.de>