Fix checkbox disabled

Signed-off-by: soupette <cyril.lpz@gmail.com>

Author: soupette

packages/buffetjs-styles/src/components/Checkbox/index.js

@@ -71,6 +71,9 @@ const Checkbox = styled.input`
   &:disabled {
     background-color: ${colors.greyIconBkgd};
     cursor: initial;
+    &:after {
+      color: ${colors.brightGrey};
+    }
   }
   & + label {
     display: inline-block;

packages/buffetjs-styles/src/components/Checkbox/tests/__snapshots__/Checkbox.test.js.snap

@@ -53,6 +53,10 @@ exports[`<Checkbox /> should match snapshot 1`] = `
   cursor: initial;
 }
 
+.c0:disabled:after {
+  color: #9ea7b8;
+}
+
 .c0 + label {
   display: inline-block;
   font-weight: 500;