fix(VHover): false isHovering by default

[vkrms]

Description

fixes #19601

Markup:

<template>
  <v-app>
    <v-container>
      <v-hover>
        <template #default="{ isHovering, props }">
          <v-badge :model-value="isHovering" content="visible on hover">
            <v-chip :label="true" class="mr-1" size="small" v-bind="props">
              {{ isHovering }}
              <span class="font-weight-bold"> Hover Over Me </span>
            </v-chip>
          </v-badge>
        </template>
      </v-hover>
    </v-container>
  </v-app>
</template>

[johnleider]

From @KaelWD's comment, should this be null as default?

#19601 (comment)

[vkrms]

From @KaelWD's comment, should this be null as default?

#19601 (comment)

Yeah I guess it should work better if someone wants to check for an element being untouched. I've introduced the fix, please check.

[johnleider]

Wouldn't this be boolean | null?

[vkrms]

@KaelWD Yeah you're right. I had to mess with other components to make typescript happy. Please review.
I'm not sure the failing cypress test has anything to do with the fix. I'm diggin into it but it does not make any sense at the moment.

[KaelWD]

Why?

[vkrms]

Oops things got a bit out of hand there. This cast should be removed.