Make automounting work even if StorageAccess is ignored

Summary:
There is no reason to make mounting dependent on the StorageAccess.ignore
flag, which just serves a a hint for visualization.

This change sneaked in when porting to KF5, no justification given.

BUG: 389479

Reviewers: ngraham, Plasma, broulik

Reviewed By: ngraham

Subscribers: plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D12050