Remove unnecessary props type for Dropdown

This removes the `disabled` prop from the `Dropdown` component. This is
already included in the default HTML props of the `select` component,
so it's not necessary to add it again.

Author: koesie10

extensions/ql-vscode/src/view/common/Dropdown.tsx

@@ -4,7 +4,7 @@ import { styled } from "styled-components";
 
 const DISABLED_VALUE = "-";
 
-const StyledDropdown = styled.select<{ disabled?: boolean }>`
+const StyledDropdown = styled.select`
   width: 100%;
   height: calc(var(--input-height) * 1px);
   background: var(--vscode-dropdown-background);