nit: Remove useless ';' and ',' (#606)

Taken out of:
https://github.com/ArthurSonzogni/FTXUI/pull/600

Co-authored-by: LostInCompilation <12819635+LostInCompilation@users.noreply.github.com>

src/ftxui/dom/scroll_indicator.cpp

@@ -64,7 +64,7 @@ Element vscroll_indicator(Element child) {
         screen.PixelAt(x, y) = Pixel();
         screen.PixelAt(x, y).character = c;
       }
-    };
+    }
   };
   return std::make_shared<Impl>(std::move(child));
 }