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}