Each of these strings would previously rely on StringView's char const*
constructor overload, which would call __builtin_strlen on the string.
Since we now have operator ""sv, we can replace these with much simpler
versions. This opens the door to being able to remove
StringView(char const*).
No functional changes.
Previously, if you opened MouseSettings, set the cursor theme to Dark,
and then click "Defaults", the cursors list would not update.
ComboBox::set_text() does not call the on_change callback, so we have
to run the steps manually.
I've also made `m_theme_name` into a local variable, since it can be.
Unfortunately, most of the users are inside constructors, (and two
others are inside callback lambdas) so the error can't propagate, but
that can be improved later.
