gtkmountoperation: Improve appearance of ask-password dialog

- Indent the save-password box to make it visually apparent that it
  belongs to the password entry above

- Remove empty label which caused an irritating big space between the
  password entry and the save-password box

- Make labels in the grid insensitive to make them appear grayed out (as
  in other GNOME applications)

- Set max-width-chars on the labels to enable wrapping and to prevent
  that the dialog's width is excessively increased by the labels
5 jobs for gtk-4-add-TCRYPT-options-to-ask-password-dialog in 21 minutes and 14 seconds (queued for 1 second)
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Status Job ID Name Coverage
  Build
passed #284297
fedora-x86_64

00:04:08

passed #284298
win32
msys2-mingw32

00:21:14

 
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flatpak-manual:demo
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flatpak-manual:icon-browser
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flatpak-manual:widget-factory