LibGfx: Remove debug output

Author: https://github.com/peterdn
Commit: https://github.com/SerenityOS/serenity/commit/a1c0eb1e1d3
Pull-request: https://github.com/SerenityOS/serenity/pull/1950

Libraries/LibGfx/ImageDecoder.cpp

@@ -34,13 +34,11 @@ ImageDecoder::ImageDecoder(const u8* data, size_t size)
 {
     m_plugin = make<PNGImageDecoderPlugin>(data, size);
     if (m_plugin->sniff()) {
-        dbg() << "Decoding image as a PNG";
         return;
     }
 
     m_plugin = make<GIFImageDecoderPlugin>(data, size);
     if (m_plugin->sniff()) {
-        dbg() << "Decoding image as a GIF";
         return;
     }
 }