content_archive: Pass and take NCASectionHeader instance by reference

Each header is 512 bytes in size, which is kind of an excessive amount
to copy all the time when it's possible to avoid doing so.

src/core/file_sys/content_archive.cpp

@@ -167,7 +167,7 @@ boost::optional<Core::Crypto::Key128> NCA::GetTitlekey() {
     return titlekey;
 }
 
-VirtualFile NCA::Decrypt(NCASectionHeader s_header, VirtualFile in, u64 starting_offset) {
+VirtualFile NCA::Decrypt(const NCASectionHeader& s_header, VirtualFile in, u64 starting_offset) {
     if (!encrypted)
         return in;
 
@@ -295,7 +295,7 @@ NCA::NCA(VirtualFile file_, VirtualFile bktr_base_romfs_, u64 bktr_base_ivfc_off
     ivfc_offset = 0;
 
     for (std::ptrdiff_t i = 0; i < number_sections; ++i) {
-        auto section = sections[i];
+        const auto& section = sections[i];
 
         if (section.raw.header.filesystem_type == NCASectionFilesystemType::ROMFS) {
             const std::size_t base_offset =

src/core/file_sys/content_archive.h

@@ -109,7 +109,7 @@ private:
     u8 GetCryptoRevision() const;
     boost::optional<Core::Crypto::Key128> GetKeyAreaKey(NCASectionCryptoType type) const;
     boost::optional<Core::Crypto::Key128> GetTitlekey();
-    VirtualFile Decrypt(NCASectionHeader header, VirtualFile in, u64 starting_offset);
+    VirtualFile Decrypt(const NCASectionHeader& header, VirtualFile in, u64 starting_offset);
 
     std::vector<VirtualDir> dirs;
     std::vector<VirtualFile> files;