Delete black & white filter on certain modals

[vbinetruy]

Delete the black & white filter that is on the blurry background for the "Suggest Another Time" and "I don't like" and "I Certify" modals. So for them, the blurry background should be in color.

PS: Let's only keep the black & white filter for modals that bring in a negative aspect (e.g SPAM and Copyright Infringement modals)