fix(picker): high contrast loading hover and disabled down state

Fixes the loading state in high contrast not showing the disabled
chevron color on hover, and disables the down state on disabled and
loading. Some added specificity was necessary.

Author: jawinn

components/picker/index.css

@@ -333,7 +333,8 @@ governing permissions and limitations under the License.
     }
   }
 
-  &.is-loading {
+  &.spectrum-Picker.is-loading {
+    transform: none;
     .spectrum-Picker-menuIcon {
       color: var(--highcontrast-picker-content-color-disabled, var(--mod-picker-icon-color-disabled, var(--spectrum-picker-icon-color-disabled)));
     }
@@ -355,8 +356,9 @@ governing permissions and limitations under the License.
 
 /* Disabled state */
 .spectrum-Picker.spectrum-Picker:disabled,
-.spectrum-Picker.is-disabled {
+.spectrum-Picker.spectrum-Picker.is-disabled {
   cursor: default;
+  transform: none;
   background-color: var(--highcontrast-picker-background-color, var(--mod-picker-background-color-disabled, var(--spectrum-picker-background-color-disabled)));
   border-color: var(--highcontrast-picker-border-color-disabled, transparent);
   color: var(--highcontrast-picker-content-color-disabled, var(--mod-picker-font-color-disabled, var(--spectrum-picker-font-color-disabled)));