When the running app had mouse reporting on, moving the pointer over a
link with ctrl/cmd held never underlined it, while pressing the modifier
with the pointer already on the link did. `mouse_move` only scheduled
the hyperlink lookup outside of mouse mode, but the modifier change and
grid refresh paths don't check it, and ctrl/cmd-click already opens
links in mouse mode through `open_links_in_mouse_mode`.
Also look up the hovered link in mouse mode when that setting is on,
after the motion has been reported to the app.
Closes#64102
dualfroz
e3da47c875