Remove stray ;'s

Originally committed to SVN as r4444.

aegisub/libaegisub/common/option_value.cpp

@@ -38,4 +38,4 @@ void OptionValue::Unsubscribe(OptionValueListener *listener, OptionValueListener
 	listeners.erase(listener);
 }
 
-};
+}

aegisub/libaegisub/include/libaegisub/exception.h

@@ -303,4 +303,4 @@ namespace agi {
 	/// @brief Some input data were invalid and could not be processed
 	DEFINE_BASE_EXCEPTION(InvalidInputException,Exception)
 
-};
+}