improve title bar in direct messages

[jrichardsen]

In direct messages, show the room title (i.e., the username) in the color of the user's status. Also, show the user's status text in parentheses.

Fixes #35

[codecov]

Codecov Report

Attention: Patch coverage is 85.91549% with 10 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/ui/widget/title_bar.rs	87.1%	9 Missing ⚠️
src/ui/app.rs	0.0%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/backend/nc_request/nc_req_data_user.rs	0.0% <ø> (ø)
src/ui/app.rs	0.0% <0.0%> (ø)
src/ui/widget/title_bar.rs	92.2% <87.1%> (-1.1%)	⬇️

... and 1 file with indirect coverage changes