Fix typo (#1529)

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### Description

Im so stupid i mistyped the literal key name 😭

Fixes #

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- [ ] New feature (non-breaking change which adds functionality)
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Author: eleboucher

src/unstable/prefixes/msc/profile.ts

@@ -25,4 +25,4 @@ export const MATRIX_UNSTABLE_MSC4466_PROPAGATE_TO = 'computer.gingershaped.msc44
  *  Unstable prefix for username colors. defined in https://github.com/matrix-org/matrix-spec-proposals/pull/4522
  */
 
-export const MATRIX_UNSTABLE_COLORS = 'eu.she-a.colors';
+export const MATRIX_UNSTABLE_COLORS = 'eu.she-a.color';