fix: change default value of input type from null to text (rrweb-io#1200)

* fix: change default value of input type from null to text

* Apply formatting changes

* add changeset

* add a comment related to the type of input element

Author: re-fort

packages/rrweb-snapshot/src/utils.ts

@@ -256,6 +256,7 @@ export function isNodeMetaEqual(a: serializedNode, b: serializedNode): boolean {
  * where passwords should be masked.
  */
 export function getInputType(element: HTMLElement): Lowercase<string> | null {
+  // when omitting the type of input element(e.g. <input />), the type is treated as text
   const type = (element as HTMLInputElement).type;
 
   return element.hasAttribute('data-rr-is-password')