Do not use open as saveAs dialog for enc files

We do not want to use existing only for files where we encrypt
to, this should be save as and not open as.
2 jobs for master in 14 minutes and 46 seconds (queued for 17 minutes and 56 seconds)
Status Name Job ID Coverage
  Build
passed build_clazy_clang_tidy #106896

00:09:54

passed linux kf5-qt5 qt5.15 #106895

00:04:51

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