fix not passing args to colorToHex in toHexString extension method

Author: imsamgarg

lib/src/utils.dart

@@ -210,6 +210,16 @@ extension ColorExtension1 on String {
 
 // Extension from Color
 extension ColorExtension2 on Color {
-  String toHexString({bool includeHashSign = false, bool enableAlpha = true, bool toUpperCase = true}) =>
-      colorToHex(this, includeHashSign: false, enableAlpha: true, toUpperCase: true);
+  String toHexString({
+    bool includeHashSign = false,
+    bool enableAlpha = true,
+    bool toUpperCase = true,
+  }) {
+    return colorToHex(
+      this,
+      includeHashSign: includeHashSign,
+      enableAlpha: enableAlpha,
+      toUpperCase: toUpperCase,
+    );
+  }
 }