Menus: Fix minor UI issues on Edit Menus screen on smaller viewports.

This removes extra margin from the Select button and ensures the checkboxes in the Menu Settings section are fully visible.

Props sabernhardt, passoniate, mukesh27, afercia, audrasjb, Boniu91, ravipatel, jomisica.
Fixes #49245, #51706.
Built from https://develop.svn.wordpress.org/trunk@49964


git-svn-id: http://core.svn.wordpress.org/trunk@49665 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/nav-menus-rtl.css

@@ -860,6 +860,7 @@ body.menu-max-depth-11 { min-width: 1280px !important; }
 
 	.menu-settings-group {
 		padding-right: 0;
+		overflow: visible;
 	}
 
 	.menu-settings-group-name {
@@ -882,6 +883,10 @@ body.menu-max-depth-11 { min-width: 1280px !important; }
 		margin: 0.5em 0;
 	}
 
+	.wp-core-ui .manage-menus .button {
+		margin-bottom: 0;
+	}
+
 	.widefat .menu-locations .menu-location-title {
 		padding-top: 16px;
 	}

wp-admin/css/nav-menus.css

@@ -859,6 +859,7 @@ body.menu-max-depth-11 { min-width: 1280px !important; }
 
 	.menu-settings-group {
 		padding-left: 0;
+		overflow: visible;
 	}
 
 	.menu-settings-group-name {
@@ -881,6 +882,10 @@ body.menu-max-depth-11 { min-width: 1280px !important; }
 		margin: 0.5em 0;
 	}
 
+	.wp-core-ui .manage-menus .button {
+		margin-bottom: 0;
+	}
+
 	.widefat .menu-locations .menu-location-title {
 		padding-top: 16px;
 	}

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.7-alpha-49963';
+$wp_version = '5.7-alpha-49964';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.