Sprinkle forms and new-password designators to make autofill and password completion less wild

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/dialogs/DeactivateAccountDialog.js

@@ -118,6 +118,7 @@ export default class DeactivateAccountDialog extends React.Component {
 
         const Field = sdk.getComponent('elements.Field');
 
+        // this is on purpose not a <form /> to prevent Enter triggering submission, to further prevent accidents
         return (
             <BaseDialog className="mx_DeactivateAccountDialog"
                 onFinished={this.props.onFinished}