Fatal error due to missing switch_to_blog() function when switching from multisite to single site

[ocean90]

Describe the bug

When the plugin is used on a multisite an option to share avatars is available. This is used in

simple-local-avatars/includes/class-simple-local-avatars.php

Lines 204 to 217 in 801cc93

	public function is_avatar_shared() {
	if (
	is_multisite() // Are we on multisite.
	&& ! isset( $this->options['shared'] ) // And our shared option doesn't exist.
	|| (
	isset( $this->options['shared'] ) // Or our shared option is set.
	&& 1 === $this->options['shared']
	)
	) {
	return true;
	}
	return false;
	}

But this check will also return true in a single site installation when the option still exists. This will cause a fatal error because switch_to_blog() doesn't exist.

simple-local-avatars/includes/class-simple-local-avatars.php

Lines 359 to 362 in 801cc93

	if ( $this->is_avatar_shared() ) {
	$origin_blog_id = isset( $local_avatars['blog_id'] ) && ! empty( $local_avatars['blog_id'] ) ? $local_avatars['blog_id'] : get_main_site_id();
	switch_to_blog( $origin_blog_id );
	}

Steps to Reproduce

1. Create a multisite
2. Activate plugin, change plugin settings
3. Upload custom avatars
4. Convert the site back to a single site
5. Go to a screen like Users where the custom avatars are rendered
6. Notice the fatal error

Screenshots, screen recording, code snippet

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Environment information

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WordPress information

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