fixup! add styles to button in WindowHeader

Author: arturbien

src/components/WindowHeader/WindowHeader.js

@@ -24,6 +24,7 @@ const SlyledWindowHeader = styled.div`
     color: ${({ theme }) => theme.textInvert};
   }
   ${StyledButton} {
+    padding: 0;
     height: 27px;
     width: 31px;
   }