stylelint: Enable selector-pseudo-element-colon-notation

Via stylelint --fix

Change-Id: I77f14cac83e4422c7962339d1177da9e65b6a28e

.stylelintrc.json

@@ -1,7 +1,6 @@
 {
 	"extends": "stylelint-config-wikimedia",
 	"rules": {
-		"declaration-property-unit-disallowed-list": null,
-		"selector-pseudo-element-colon-notation": null
+		"declaration-property-unit-disallowed-list": null
 	}
 }

resources/css/ext.uls.interface.less

@@ -10,8 +10,8 @@
 
 		// override grid styles, as we use flexbox here
 		&.row {
-			&:before,
-			&:after {
+			&::before,
+			&::after {
 				content: none;
 			}
 		}

resources/css/ext.uls.mixins.less

@@ -1,8 +1,8 @@
 // Generate a caret by embedding in the callout.
 // Expects callout to have either selector-right or selecter-left class on it to determine directionality.
 .caret() {
-	&:before,
-	&:after {
+	&::before,
+	&::after {
 		border-top: 10px solid transparent;
 		border-bottom: 10px solid transparent;
 		display: inline-block;
@@ -13,14 +13,14 @@
 	}
 
 	&.selector-right {
-		&:before {
+		&::before {
 			/* @noflip */
 			border-left: 10px solid #c8ccd1;
 			/* @noflip */
 			right: -11px;
 		}
 
-		&:after {
+		&::after {
 			/* @noflip */
 			border-left: 10px solid #fff;
 			/* @noflip */
@@ -29,14 +29,14 @@
 	}
 
 	&.selector-left {
-		&:before {
+		&::before {
 			/* @noflip */
 			border-right: 10px solid #c8ccd1;
 			/* @noflip */
 			left: -11px;
 		}
 
-		&:after {
+		&::after {
 			/* @noflip */
 			border-right: 10px solid #fff;
 			/* @noflip */

resources/css/ext.uls.pt.less

@@ -37,7 +37,7 @@
 		padding-left: 0;
 
 		// Putting the icon in before in order to apply `opacity`.
-		&:before {
+		&::before {
 			content: '';
 			background-image: url( ../../lib/jquery.uls/images/language.svg );
 			// Same values as Vector's `#pt-userpage a`.