video_core, yuzu: write NVIDIA DLSS file paths to logs as UTF-8

The Streamline start-up and DLSS download code formatted paths with std::filesystem::path::string(),
which on MSVC converts to the active code page and throws when a character has no mapping there,
for example a user name in another script under %APPDATA%. The start-up log runs inside the
renderer's constructor, which only catches vk::Exception, so such a user would crash at game start
with the setting on.

Use Common::FS::PathToUTF8String for every path in these logs and messages.

Found by CodeRabbit review.

Assisted-by: Claude Opus 5.5 (implementation)
Signed-off-by: Duck912 <350528965+Duck912@users.noreply.github.com>

0 files changed, 0 insertions, 0 deletions