fix(accordion): remove variable assigned to itself

Variable assigned to itself was showing an undefined variable in the
inspector, as this circular reference is treated as invalid.

Author: jawinn

components/accordion/index.css

@@ -22,7 +22,6 @@
 	--spectrum-accordion-edge-to-text-space: var(--spectrum-accordion-edge-to-text);
 	--spectrum-accordion-item-header-top-to-text-space: var(--spectrum-accordion-top-to-text-regular-medium);
 	--spectrum-accordion-item-header-bottom-to-text-space: var(--spectrum-accordion-bottom-to-text-regular-medium);
-	--spectrum-accordion-focus-indicator-gap: var(--spectrum-accordion-focus-indicator-gap);
 	--spectrum-accordion-focus-indicator-thickness: var(--spectrum-focus-indicator-thickness);
 	--spectrum-accordion-corner-radius: var(--spectrum-corner-radius-medium-size-medium);
 	--spectrum-accordion-item-content-area-top-to-content: var(--spectrum-accordion-content-area-top-to-content);