Issue #229

Changes

• implements solution proposed by @cdellacqua that prevents clicking the inner modal from closing the modal
• removes stopPropagation modifier to the PasswordInput "toggle password" button (reverts PR fix(password-input): stop propagation when toggling input type #230)

To test:

1. Open the default Modal/Composed Modal stories
2. Click outside the modal and verify that it closes
3. Re-open and press escape or click the "X" button; verify that it closes
4. Re-open and click the password input "toggle password" button; verify that the modal does not close

For both the Modal/Composed Modal stories, the on:click event logs e.target to the browser console. This demonstrates that the event bubbling behavior is preserved.