dolphinviewcontainer: let the user open a file that was a directory

when trying to open a file as directory we run into a IsFile error and
instead open the parent directory. this is a bit inconvenient when the
user actually wants to open a file. allow them to redirect the request
to the correct API instead. this ensures backwards compatible behavior
but introduces new strings that require localization.

ultimately being able to open files this way is a bit of any-feature
though.

CCBUG: 516830

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