dolphinviewcontainer: do not implicitly open directories as files

we already have xdg-run, we don't need another runner interface ;)

notably if the user disabled the ask-before-execute guard rail from KIO,
they would also implicitly allow other applications to execute any file
by invoking it through dolphin, that would be a bit silly and isn't the
point of the guard rail opt-out.

when detecting a file we now instead open the parent

Should improve
CCBUG: 516830

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