PermissionDialog: fix dialog spawn loop

On a new install, the manageMediaPermsCheck onclicklistener will
ask for video/audio permission for API 33+, but for 30+ goes to
getStoragePermission which ends calling requestStorageAccess.
When API 30+ this will spawn a new PermissionListDialog, creating a
loop.

In the onClickListener, asking for READ_EXTERNAL_STORAGE straight away
for API 30+ solves this.