Add option to disable the DM roomsublist split

[ara4n]

[t3chguy]

I believe this will be fixed by upcoming changes around the left panel

[EverysAlex]

The non-perfect workaround is to enable All settings > Sidebar > People, which puts people notifications separately on left bar.

[rotsix]

Hey, this appears to be the last issue not being closed about combining People and Rooms.
I've tried the method above, but it's only merging the people from the different Spaces in a new dedicated Space, so not the actual issue.

Could we have some news from the developers? @rufuskahler & @t3chguy?
Thanks a lot for your work and maintaining this software, but we've been lacking this feature -or should I say- we've been enforced to use this feature for years, and all the other issues seem to be closed without news heh.