[FIX] hr_timesheet: fix the remaining hours label on project sharing

Before this commit, when remaining hours is negative then it the
label was displayed as muted instead of danger.

So in this commit, display the label danger when remaning hours
are negative.

task-3014420

closes odoo/odoo#104601

Related: odoo/enterprise#33447
Signed-off-by: Xavier Bol (xbo) <xbo@odoo.com>