fix: match possible whitespace chars at the start

Signed-off-by: Chinmay D. Pai <chinmaydpai@gmail.com>

src/js/utils/colors.js

@@ -37,8 +37,8 @@ export function lightenDarkenColor(color, amt) {
 
 export function isValidColor(string) {
 	// https://stackoverflow.com/a/32685393
-	let HEX_RE = /^(#)((?:[A-Fa-f0-9]{3}){1,2})$/i
-	let RGB_RE = /^(rgb|hsl)(a?)[(]\s*([\d.]+\s*%?)\s*,\s*([\d.]+\s*%?)\s*,\s*([\d.]+\s*%?)\s*(?:,\s*([\d.]+)\s*)?[)]$/i
+	let HEX_RE = /(^\s*)(#)((?:[A-Fa-f0-9]{3}){1,2})$/i
+	let RGB_RE = /(^\s*)(rgb|hsl)(a?)[(]\s*([\d.]+\s*%?)\s*,\s*([\d.]+\s*%?)\s*,\s*([\d.]+\s*%?)\s*(?:,\s*([\d.]+)\s*)?[)]$/i
 	return HEX_RE.test(string) || RGB_RE.test(string);
 }