Added force-sync option to overflow menu (#398)

* Added force-sync option to overflow menu

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Updated description of FORCE_RESYNC

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Update KDoc

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Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>
Co-authored-by: Sunik Kupfer <kupfer@bitfire.at>