Reduce scope for confusion between Tips and Gloss

[AlanGriffiths]

We've failed to distinguished "Gloss" and "Tip" in our window management implementation, and that's led us to labelling "Tips" mir_window_type_gloss.

Label "Tips" mir_window_type_tip correctly. (Issue about the incorrect "Gloss" implementation: #3045.)

[codecov]

Codecov Report

Merging #3044 (ce595be) into main (7f713c7) will not change coverage.
Report is 2 commits behind head on main.
The diff coverage is 33.33%.

@@           Coverage Diff           @@
##             main    #3044   +/-   ##
=======================================
  Coverage   77.70%   77.70%           
=======================================
  Files        1056     1056           
  Lines       73397    73397           
=======================================
  Hits        57031    57031           
  Misses      16366    16366           

Files Changed	Coverage Δ
src/server/frontend_wayland/wl_shell.cpp	38.40% <0.00%> (ø)
src/server/frontend_xwayland/xwayland_surface.cpp	0.00% <0.00%> (ø)
src/server/frontend_wayland/xdg_shell_stable.cpp	81.28% <100.00%> (ø)
src/server/frontend_wayland/xdg_shell_v6.cpp	76.30% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[mattkae]

Makes sense to me!