LibGfx+Ladybird+Userland: Don't sniff for TGA images with only raw bytes

Because TGA images don't have magic bytes as a signature to be detected,
instead assume a sequence of ReadonlyBytes is a possible TGA image only
if we are given a path so we could check the extension of the file and
see if it's a TGA image.

When we know the path of the file being loaded, we will try to first
check its extension, and only if there's no match to a known decoder,
based on simple extension lookup, then we would probe for other formats
as usual with the normal sniffing method.

Userland/Utilities/file.cpp

@@ -33,7 +33,7 @@ static Optional<DeprecatedString> image_details(DeprecatedString const& descript
         return {};
 
     auto& mapped_file = *file_or_error.value();
-    auto image_decoder = Gfx::ImageDecoder::try_create(mapped_file.bytes());
+    auto image_decoder = Gfx::ImageDecoder::try_create_for_raw_bytes_with_known_path(path, mapped_file.bytes());
     if (!image_decoder)
         return {};