Re-add default field after style update

src/components/fields/ZoomSpecField.jsx

@@ -190,6 +190,20 @@ export default class ZoomSpecProperty  extends React.Component {
             />
           </div>
         </div>
+        <div className="maputnik-data-spec-property-group">
+          <DocLabel
+            label="Default"
+            doc={"Input a default value for data if not covered by the scales."}
+          />
+          <div className="maputnik-data-spec-property-input">
+            <SpecField
+              fieldName={this.props.fieldName}
+              fieldSpec={this.props.fieldSpec}
+              value={this.props.value.default}
+              onChange={propVal => this.changeDataProperty("default", propVal)}
+            />
+          </div>
+        </div>
       </InputBlock>
     </div>
       {dataFields}