Fix broken tooltips on validation list tables

[felixarntz]

No longer used. The dependencies do not actually depend on it.

[westonruter]

@felixarntz I think this is actually being used, though #2148 appears may have broken them.

Admin pointers were being used for the tooltips in the validated URLs post list table:

As well as on the validation error taxonomy term list table:

In the amp-stories-redux branch, clicking these now does nothing.

They are working in the develop branch however.

Ultimately, as identified in #1479 we need to eliminate the use of pointers altogether for this purpose.

@felixarntz Could you use this PR to fix the pointers broken in #2148?

[westonruter]

@felixarntz I don't think these changes are right. I think it is this code that should be restored:

amp-wp/includes/admin/class-amp-admin-pointer.php

Line 47 in 9d263d6

add_action( 'admin_enqueue_scripts', array( $this, 'register_tooltips' ) );

amp-wp/includes/admin/class-amp-admin-pointer.php

Lines 79 to 99 in 9d263d6

	/**
	* Registers style and script for tooltips.
	*
	* @since 1.0
	*/
	public function register_tooltips() {
	wp_register_style(
	self::TOOLTIP_SLUG,
	amp_get_asset_url( 'css/' . self::TOOLTIP_SLUG . '.css' ),
	array( 'wp-pointer' ),
	AMP__VERSION
	);
	wp_register_script(
	self::TOOLTIP_SLUG,
	amp_get_asset_url( 'js/' . self::TOOLTIP_SLUG . '.js' ),
	array( 'jquery', 'wp-pointer' ),
	AMP__VERSION,
	true
	);
	}

This code is in develop and 1.1 so no need to milestone the changes for 1.1.1.

[westonruter]

Actually, since we have to revisit this anyway in #1479 it seems fine to just go ahead and merge this now.