Removed unnecessary semicolons causing warnings

Former-commit-id: 900af4bfbf [formerly 75bccd104c]
Former-commit-id: 172aceef7e

src/storage/jani/JSONExporter.h

@@ -9,7 +9,7 @@
 #include "json.hpp"
 namespace modernjson {
     using json = nlohmann::basic_json<std::map, std::vector, std::string, bool, int64_t, uint64_t, double, std::allocator>;
-};
+}
 
 namespace storm {
     namespace jani {