UICommon/ResourcePack: Provide inequality operator to complement equality operator

Provides symmetrical behavior with the equality operator.

Source/Core/UICommon/ResourcePack/ResourcePack.cpp

@@ -325,4 +325,9 @@ bool ResourcePack::operator==(const ResourcePack& pack) const
   return pack.GetPath() == m_path;
 }
 
+bool ResourcePack::operator!=(const ResourcePack& pack) const
+{
+  return !operator==(pack);
+}
+
 }  // namespace ResourcePack

Source/Core/UICommon/ResourcePack/ResourcePack.h

@@ -31,6 +31,7 @@ public:
   bool Uninstall(const std::string& path);
 
   bool operator==(const ResourcePack& pack) const;
+  bool operator!=(const ResourcePack& pack) const;
 
 private:
   bool m_valid = true;