[tidy] Check modernize-pass-by-value

Ref: http://clang.llvm.org/extra/clang-tidy/checks/modernize-pass-by-value.html

src/mbgl/annotation/annotation_tile.cpp

@@ -36,8 +36,8 @@ optional<Value> AnnotationTileFeature::getValue(const std::string& key) const {
     return optional<Value>();
 }
 
-AnnotationTileLayer::AnnotationTileLayer(const std::string &name_)
-    : name(name_) {}
+AnnotationTileLayer::AnnotationTileLayer(std::string name_)
+    : name(std::move(name_)) {}
 
 util::ptr<GeometryTileLayer> AnnotationTileData::getLayer(const std::string& name) const {
     auto it = layers.find(name);