Allow sharing multiple photos from albums view in android app

[underscore-j]

Is your feature request related to a problem? Please describe.

It seems to currently not be possible to select and share multiple images from an album via the android app (while it is possible to do so from the timeline and folder views).

Describe the solution you'd like

When selecting multiple photos from an album, the "share" option should be shown in the context menu, the same way it is done in the timeline and folder views.

Describe alternatives you've considered

A possible workaround is to select the images from either the timeline or folder views.
However, this does not work for shared albums.

Images from albums can also be shared individually, but this is very annoying to both the sender and the receiver.

Additional context

The desired functionality is the same as described in #901, just accessible from the albums view as well.