delete more unused icons. closes #3294

assets/css/woocommerce.less

@@ -1250,19 +1250,7 @@ p.demo_store {
 				-webkit-box-shadow:none;
 				box-shadow:none;
 			}
-			&.validate-required.woocommerce-validated {
-				input.input-text {
-					background-image: url(../images/icons/valid.png);
-					background-position: 95% center;
-					background-repeat: no-repeat;
-				}
-			}
 			&.validate-required.woocommerce-invalid {
-				input.input-text {
-					background-image: url(../images/icons/invalid.png);
-					background-position: 95% center;
-					background-repeat: no-repeat;
-				}
 				.chosen-single, .chosen-drop, input.input-text, select {
 					border-color: #fb7f88;
 				}
@@ -1676,14 +1664,6 @@ p.demo_store {
 				}
 			}
 		}
-		.woocommerce form .form-row.validate-required.woocommerce-validated input.input-text, .woocommerce-page form .form-row.validate-required.woocommerce-validated input.input-text {
-			background-image: url(../images/icons/valid@2x.png);
-			background-size: 12px 9px;
-		}
-		.woocommerce form .form-row.validate-required.woocommerce-invalid input.input-text, .woocommerce-page form .form-row.validate-required.woocommerce-invalid input.input-text {
-			background-image: url(../images/icons/invalid@2x.png);
-			background-size: 12px 9px;
-		}
 		p.stars {
 			span {
 				background-image: url(../images/star@2x.png);