fix(MessageView): use correct icon and color for default type (#6016)

Author: Lukas742

packages/main/src/components/MessageView/index.tsx

@@ -219,7 +219,7 @@ const MessageView = forwardRef<MessageViewDomRef, MessageViewPropTypes>((props,
               {selectedMessage && (
                 <FlexBox className={classNames.details}>
                   <Icon
-                    data-type={selectedMessage.type}
+                    data-type={selectedMessage.type ?? ValueState.Negative}
                     name={getIconNameForType(selectedMessage.type)}
                     className={classNames.detailsIcon}
                   />