bug(strong-focus): Mixin causes error when passed color value

[literalpie]

Colors as an input was supported in 12.0, and is not supported in 12.1.x. I think this is an unintentional breaking change.

Reproduction

Steps to reproduce:
This works in 12.0.2, but not in 12.1.1

@include mat-strong-focus-indicators-theme(blue);

(I don't think custom themes work in Stackblitz?)

Expected Behavior

It should build properly

Actual Behavior

Building fails and there is an error

Sass error: $map2: blue is not a map

Environment

• Angular: 12.1
• CDK/Material: 12.1.1
• Browser(s): n/a
• Operating System (e.g. Windows, macOS, Ubuntu): Windows and Mac

See conversation in #23016. This was fixed, but has not been merged because it was marked as a feature, not a bug fix. I think this should be important enough to prioritize a fix asap since it breaks code that previously works

[wagnermaciel]

Fixed by #23134.

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