Add red cancel icon and styling.

src/skins/vector/css/matrix-react-sdk/views/rooms/_AppsDrawer.scss

@@ -83,6 +83,10 @@ limitations under the License.
     border: 1px solid transparent;
 }
 
+.mx_AppTileMenuBarWidgetDelete {
+    filter: none;
+}
+
 .mx_AppTileMenuBarWidget:hover {
     border: 1px solid $primary-hairline-color;
     border-radius: 2px;

src/skins/vector/img/cancel-red.svg

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg width="18px" height="18px" viewBox="0 0 18 18" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:sketch="http://www.bohemiancoding.com/sketch/ns">
+    <!-- Generator: Sketch 3.4.2 (15857) - http://www.bohemiancoding.com/sketch -->
+    <title>Slice 1</title>
+    <desc>Created with Sketch.</desc>
+    <defs></defs>
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd" sketch:type="MSPage">
+        <path d="M9.74464309,-3.02908503 L8.14106175,-3.02908503 L8.14106175,8.19448443 L-3.03028759,8.19448443 L-3.03028759,9.7978515 L8.14106175,9.7978515 L8.14106175,20.9685098 L9.74464309,20.9685098 L9.74464309,9.7978515 L20.9697124,9.7978515 L20.9697124,8.19448443 L9.74464309,8.19448443 L9.74464309,-3.02908503" id="Fill-108" opacity="0.9" fill="#ff0064" sketch:type="MSShapeGroup" transform="translate(8.969712, 8.969712) rotate(-315.000000) translate(-8.969712, -8.969712) "></path>
+    </g>
+</svg>