service: Resolve trivially avoidable copies (#5237)

* am/am: Avoid redundant copy in GetProgramInfoFromCia()

We can just use a reference to the title metadata. Avoids copying
several data entries and std::vector instances that don't need to be
copied.

* hle/service: Avoid redundant copying of std::string

GetUserPath() returns the path as a reference, so we can make use of
said reference to avoid making copies.

src/core/hle/service/cfg/cfg.cpp

@@ -555,7 +555,7 @@ ResultCode Module::FormatConfig() {
 } // namespace Service::CFG
 
 ResultCode Module::LoadConfigNANDSaveFile() {
-    std::string nand_directory = FileUtil::GetUserPath(FileUtil::UserPath::NANDDir);
+    const std::string& nand_directory = FileUtil::GetUserPath(FileUtil::UserPath::NANDDir);
     FileSys::ArchiveFactory_SystemSaveData systemsavedata_factory(nand_directory);
 
     // Open the SystemSaveData archive 0x00010017