made signin appear on the login page and fixed the padding issue

res/css/views/auth/_AuthBody.scss

@@ -114,7 +114,7 @@ limitations under the License.
 }
 
 .mx_AuthBody_paddedFooter {
- height: 80px; // height of the submit button + register link
+ height: 57px; // height of the submit button + register link
  padding-top: 28px;
  text-align: center;
 

src/components/views/auth/PasswordLogin.tsx

@@ -434,7 +434,7 @@ export default class PasswordLogin extends React.PureComponent<IProps, IState> {
  ref={field => this[LoginField.Password] = field}
  />
  { forgotPasswordJsx }
- { !this.props.busy && <input className="mx_Login_submit"
+ { <input className="mx_Login_submit"
  type="submit"
  value={_t('Sign in')}
  disabled={this.props.disableSubmit}