fix: fix vertical line misaligned in firefox

closes #503

Author: RomanHotsiy

src/common-elements/fields-layout.ts

@@ -117,7 +117,7 @@ export const InnerPropertiesWrap = styled.div`
 `;
 
 export const PropertiesTable = styled.table`
-  border-collapse: collapse;
+  border-collapse: separate;
   border-radius: 3px;
   font-size: ${props => props.theme.baseFont.size};