LibGfx: Make BMPWriter::dump() not take a RefPtr

Author: https://github.com/nico
Commit: a2ccf38f11
Pull-request: https://github.com/SerenityOS/serenity/pull/17826
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibGfx/BMPWriter.h

@@ -30,7 +30,7 @@ public:
 private:
     BMPWriter() = default;
 
-    ByteBuffer dump(RefPtr<Bitmap const>, Options options);
+    ByteBuffer dump(Bitmap const&, Options options);
 
     enum class Compression : u32 {
         BI_RGB = 0,