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/cecd/cecd.cpp

@@ -1381,7 +1381,7 @@ Module::Module(Core::System& system) : system(system) {
     change_state_event =
         system.Kernel().CreateEvent(Kernel::ResetType::OneShot, "CECD::change_state_event");
 
-    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 0x00010026