fix(modal theme): fix modal vertical positioning

A previous PR (#601) broke vertical positioning for modals. This reverts such changes.

Author: Ncookiez

src/lib/theme/default.ts

@@ -541,7 +541,7 @@ const theme: FlowbiteTheme = {
       },
     },
     content: {
-      base: 'relative h-full w-full p-4',
+      base: 'relative h-full w-full p-4 md:h-auto',
       inner: 'relative rounded-lg bg-white shadow dark:bg-gray-700',
     },
     body: {