Twenty Fifteen: remove Color Scheme custom control

[cainm]

Now that the Color Scheme control is just a select dropdown with some additional JS to update the other color controls, we can probably remove the custom control and enqueue the JS on customize_controls_enqueue_scripts.

Related: #29959

[cainm]

Remove Color Scheme custom control

[celloexpressions]

+1. Please use "Customizer" instead of "Theme Customizer" in the code comments (and everywhere), but otherwsie 29982.diff​ looks good.

[cainm]

Replying to celloexpressions:

+1. Please use "Customizer" instead of "Theme Customizer" in the code comments (and everywhere), but otherwsie 29982.diff​ looks good.

Will do. I was just following suit with the rest of the file. Should we open a ticket to clean up all the instances?

[celloexpressions]

Replying to cainm:

Replying to celloexpressions:

+1. Please use "Customizer" instead of "Theme Customizer" in the code comments (and everywhere), but otherwsie 29982.diff​ looks good.

Will do. I was just following suit with the rest of the file. Should we open a ticket to clean up all the instances?

Yes, if there are a lot of those in Twenty Fifteen, we should do a ticket like #29947 for the theme.

[celloexpressions]

Actually, latest patch on #29947 takes care of Twenty Fifteen also.

[cainm]

Updated to switch instances of 'Theme Customizer' with 'Customizer' in 29981.2.diff

[iamtakashi]

Thanks cainm, the patch looks great.

Once this is committed we can close #29959.

[iandstewart]

In 29944:

Twenty Fifteen: Removing unused custom color controls.

Props cainm, fixes #29982 and #29959.