partition_data_manager: Take package2_keys by const reference

These are only ever read from, so we don't need to make a copy of all
the keys here.

src/core/crypto/partition_data_manager.cpp

@@ -447,7 +447,7 @@ bool AttemptDecrypt(const std::array<u8, 16>& key, Package2Header& header) {
     return false;
 }
 
-void PartitionDataManager::DecryptPackage2(std::array<std::array<u8, 16>, 0x20> package2_keys,
+void PartitionDataManager::DecryptPackage2(const std::array<Key128, 0x20>& package2_keys,
                                            Package2Type type) {
     FileSys::VirtualFile file = std::make_shared<FileSys::OffsetVfsFile>(
         package2[static_cast<size_t>(type)],

src/core/crypto/partition_data_manager.h

@@ -60,7 +60,8 @@ public:
     // Package2
     bool HasPackage2(Package2Type type = Package2Type::NormalMain) const;
     FileSys::VirtualFile GetPackage2Raw(Package2Type type = Package2Type::NormalMain) const;
-    void DecryptPackage2(std::array<std::array<u8, 16>, 0x20> package2, Package2Type type);
+    void DecryptPackage2(const std::array<std::array<u8, 16>, 0x20>& package2_keys,
+                         Package2Type type);
     const std::vector<u8>& GetPackage2FSDecompressed(
         Package2Type type = Package2Type::NormalMain) const;
     std::array<u8, 0x10> GetKeyAreaKeyApplicationSource(