Set cursor to left_ptr when mouse is over a notification on wayland

[GorrillaRibs]

As in mako here: emersion/mako@85a3e38

Currently (on wayland) the cursor remains what it was when the mouse enters the notification window (i.e. from a terminal or a text entry box it'll be a vertical bar), this fixes that.

Code is taken from mako (which used to have the same issue) and adapted a little to fit dunst.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.21%. Comparing base (3055efd) to head (e6222d8).
⚠️ Report is 835 commits behind head on master.

Files with missing lines	Patch %	Lines
src/wayland/wl.c	0.00%	30 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #903      +/-   ##
==========================================
- Coverage   60.50%   60.21%   -0.30%     
==========================================
  Files          39       39              
  Lines        6228     6258      +30     
==========================================
  Hits         3768     3768              
- Misses       2460     2490      +30     

Flag	Coverage Δ
unittests	60.21% <0.00%> (-0.30%)	⬇️

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[fwsmit]

Thanks for porting this patch. I've got a few style comments, but other than that it looks good

[GorrillaRibs]

I think I've fixed everything brought up, but I haven't really used pull requests on github before, so I might've missed something - please let me know if there's any issues!

[fwsmit]

@GorrillaRibs Looks great! If you could squash the commits into the first one I'll merge the PR.

[GorrillaRibs]

Done!

[fwsmit]

Thank you :)