LibPDF: Call dbgln() for unimplemented flex upcodes

Author: https://github.com/nico
Commit: 4cc24548f6
Pull-request: https://github.com/SerenityOS/serenity/pull/21628
Reviewed-by: https://github.com/trflynn89

Userland/Libraries/LibPDF/Fonts/Type1FontProgram.cpp

@@ -500,6 +500,7 @@ PDFErrorOr<Type1FontProgram::Glyph> Type1FontProgram::parse_glyph(ReadonlyBytes
                 case Hflex1:
                 case Flex1:
                     // TODO: implement these
+                    dbgln_if(PDF_DEBUG, "Unimplemented flex: 12 {}", data[i]);
                     state.sp = 0;
                     break;