Dont provide option to set colors for standard report cards since they are hardcoded

[mahalakshme]

AC:

In the webapp, dont provide option to select color when standard report card type is selected

This is to avoid confusion, since standard report cards comes with its own colors set.

[ombhardwajj]

Hey @mahalakshme , @vinayvenu I've fixed this issue and henceforth submitted a PR.