fix the editor color for single checkbox

Author: enejb

projects/packages/forms/src/blocks/contact-form/editor.scss

@@ -503,6 +503,7 @@
 	.wp-block-jetpack-field-option-radio {
 		display: flex;
 		align-items: baseline; /* Align input with first label line */
+		color: var(--jetpack--contact-form--text-color);
 
 		.jetpack-option__type:before {
 			color: var(--jetpack--contact-form--border-color);