fix(membrane-keypad): typo in default keys value

Author: urish

src/membrane-keypad-element.ts

@@ -28,7 +28,7 @@ export class MembraneKeypadElement extends LitElement {
    * Key labels
    */
   @property({ type: Array }) keys = [
-    '0',  '1',  '2',  'A',
+    '1',  '2',  '3',  'A',
     '4',  '5',  '6',  'B',
     '7',  '8',  '9',  'C',
     '*',  '0',  '#',  'D',