fix 'H', 'L', 't', 'T', 'r', 'R', 's', 'gh' in mozilla126

fix 'H', 'L', 't', 'T', 'r', 'R', 's', 'gh' in mozilla126

these were moved to a utility class and converted from plain functions
to class methods. because BrowserCommands.reload*() calls
this.reloadWithFlags(...), we can't use (a or b)() as that clobbers the
scope of `this`. that could be worked around like so, but that's horrid:

  (vim.window.BrowserCommands?.reload.bind(vim.window.BrowserCommands) or vim.window.BrowserReload)()

regressed-by: https://bugzilla.mozilla.org/show_bug.cgi?id=1880914