Swap toolbar icon on hover

⚠️ in document toolbars the destroy icon is used instead of drive
it is a placeholder because the drive icon is not in CPtools

customize.dist/src/less2/include/toolbar.less

@@ -811,6 +811,15 @@
                     font-size: 45px;
                 }
 
+                &:hover {
+                    .cptools::before {
+                        content: "\e91f";
+                    }
+                    .fa::before {
+                        content: "\f015";
+                    }
+                }
+
                 // svg {
                 //     #outline, #squares {
                 //         fill: @toolbar-bg-color;