Without the explicit dependency to `polkit-elogind` the packages
`polkit` and `polkit-libs` are installed. This however prevents starting
`sway`. Below is the error message from the `tinydm` log:
```
00:00:00.028 [ERROR] [wlr] [libseat] [libseat/backend/logind.c:310] Could not activate session: Interactive authentication required.
00:00:00.028 [ERROR] [wlr] [libseat] [libseat/libseat.c:79] No backend was able to open a seat
00:00:00.028 [ERROR] [wlr] [backend/session/session.c:84] Unable to create seat: Function not implemented
00:00:00.028 [ERROR] [wlr] [backend/session/session.c:218] Failed to load session backend
00:00:00.028 [ERROR] [wlr] [backend/backend.c:353] Failed to start a DRM session
00:00:00.028 [ERROR] [sway/server.c:53] Unable to create backend
```
Signed-off-by: Paul Spooren <mail@aparcar.org>
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