Before this commit the progress bar options were broken because the
stripe effect is achieved by a gradient in the CSS, but
`SnippetOptionWidget` recognized it as a manually selected gradient, and
thus applied the gradient specific handling (such as neutralizing the
background-image when a color is selected).
After this commit the special handling for gradients is only applied
where gradients are expected to be selected manually (i.e. when the
`withGradients` parameter is set).
task-2662401
closesodoo/odoo#77881
X-original-commit: f873c1d1eb05fa25717817c85899629103dcada3
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>