Highlight inputs when hovering over them to match scratch-gui

Author: GarboMuffin

src/components/forms/input.css

@@ -40,6 +40,10 @@ Edited to add input-range-small
     min-width: 0;
 }
 
+.input-form:hover {
+    border-color: $looks-secondary;
+}
+
 .input-form:focus {
     border-color: $looks-secondary;
     box-shadow: 0 0 0 $grid-unit $looks-transparent;