vfs: Use sanitized paths within MoveFile() and MoveDirectory()

Previously these were being unused (or partially unused). While we're at
it, use better naming to make it visibly obvious which variant of the
path is being used.

src/core/file_sys/vfs.cpp

@@ -74,15 +74,15 @@ VirtualFile VfsFilesystem::CopyFile(std::string_view old_path_, std::string_view
     return new_file;
 }
 
-VirtualFile VfsFilesystem::MoveFile(std::string_view old_path_, std::string_view new_path_) {
-    const auto old_path = FileUtil::SanitizePath(old_path_);
-    const auto new_path = FileUtil::SanitizePath(new_path_);
+VirtualFile VfsFilesystem::MoveFile(std::string_view old_path, std::string_view new_path) {
+    const auto sanitized_old_path = FileUtil::SanitizePath(old_path);
+    const auto sanitized_new_path = FileUtil::SanitizePath(new_path);
 
     // Again, non-default impls are highly encouraged to provide a more optimized version of this.
-    auto out = CopyFile(old_path_, new_path_);
+    auto out = CopyFile(sanitized_old_path, sanitized_new_path);
     if (out == nullptr)
         return nullptr;
-    if (DeleteFile(old_path))
+    if (DeleteFile(sanitized_old_path))
         return out;
     return nullptr;
 }
@@ -137,15 +137,15 @@ VirtualDir VfsFilesystem::CopyDirectory(std::string_view old_path_, std::string_
     return new_dir;
 }
 
-VirtualDir VfsFilesystem::MoveDirectory(std::string_view old_path_, std::string_view new_path_) {
-    const auto old_path = FileUtil::SanitizePath(old_path_);
-    const auto new_path = FileUtil::SanitizePath(new_path_);
+VirtualDir VfsFilesystem::MoveDirectory(std::string_view old_path, std::string_view new_path) {
+    const auto sanitized_old_path = FileUtil::SanitizePath(old_path);
+    const auto sanitized_new_path = FileUtil::SanitizePath(new_path);
 
     // Non-default impls are highly encouraged to provide a more optimized version of this.
-    auto out = CopyDirectory(old_path_, new_path_);
+    auto out = CopyDirectory(sanitized_old_path, sanitized_new_path);
     if (out == nullptr)
         return nullptr;
-    if (DeleteDirectory(old_path))
+    if (DeleteDirectory(sanitized_old_path))
         return out;
     return nullptr;
 }