Upgrade formatting to clang-format 10 (#5895)

* Update formatting tools to clang-format-10

* Reformat using clang-format-10.0.09

src/engine/polyline_compressor.cpp

@@ -75,6 +75,6 @@ std::int32_t decode_polyline_integer(std::string::const_iterator &first,
     result = ((result & 1) == 1) ? ~(result >> 1) : (result >> 1);
     return static_cast<std::int32_t>(result);
 }
-}
-}
-}
+} // namespace detail
+} // namespace engine
+} // namespace osrm