Add dark: to button light theme (#954)

tailwind-merge was trashing `bg-white` because of this floating class

src/components/Button/theme.ts

@@ -11,7 +11,7 @@ export const buttonTheme: FlowbiteButtonTheme = {
     gray: 'text-gray-900 bg-white border border-gray-200 enabled:hover:bg-gray-100 enabled:hover:text-cyan-700 :ring-cyan-700 focus:text-cyan-700 dark:bg-transparent dark:text-gray-400 dark:border-gray-600 dark:enabled:hover:text-white dark:enabled:hover:bg-gray-700 focus:ring-2',
     info: 'text-white bg-cyan-700 border border-transparent enabled:hover:bg-cyan-800 focus:ring-4 focus:ring-cyan-300 dark:bg-cyan-600 dark:enabled:hover:bg-cyan-700 dark:focus:ring-cyan-800',
     light:
-      'text-gray-900 bg-white border border-gray-300 enabled:hover:bg-gray-100 focus:ring-4 focus:ring-cyan-300 :bg-gray-600 dark:text-white dark:border-gray-600 dark:enabled:hover:bg-gray-700 dark:enabled:hover:border-gray-700 dark:focus:ring-gray-700',
+      'text-gray-900 bg-white border border-gray-300 enabled:hover:bg-gray-100 focus:ring-4 focus:ring-cyan-300 dark:bg-gray-600 dark:text-white dark:border-gray-600 dark:enabled:hover:bg-gray-700 dark:enabled:hover:border-gray-700 dark:focus:ring-gray-700',
     purple:
       'text-white bg-purple-700 border border-transparent enabled:hover:bg-purple-800 focus:ring-4 focus:ring-purple-300 dark:bg-purple-600 dark:enabled:hover:bg-purple-700 dark:focus:ring-purple-900',
     success: