Bring back hoverability of dropdown menu (e.g. "More" tab)

Looks like I72165ba3784da3fcc9d1dd7076b3a6c96e670a2f removed the hover.
This brings it back.

Note this also makes the language button hoverable and will probably
need an additional specific selector (although the language button has
not been enabled anywhere yet)

Bug: T273143
Change-Id: Iac0539313eca5ba8d7ac165d31d2c028e803eacc

resources/skins.vector.styles/LanguageButton.less

@@ -17,6 +17,11 @@
 		&:after {
 			top: 0;
 		}
+
+		&:hover,
+		&:focus {
+			color: inherit;
+		}
 	}
 
 	.vector-menu-content {

resources/skins.vector.styles/MenuDropdown.less

@@ -66,6 +66,7 @@
 		z-index: @z-index-menu;
 	}
 
+	&:hover .vector-menu-content,
 	.vector-menu-checkbox:checked ~ .vector-menu-content {
 		opacity: 1;
 		visibility: visible;