LibPDF: Ignore seac PS1 commands for now

This command is meant to print an Standard Encoding Accented Character.
It's not critical to implement it yet, but if we want to render more
documents we need to handle the instruction, even if simply ignore it.

Userland/Libraries/LibPDF/Fonts/PS1FontProgram.cpp

@@ -38,6 +38,7 @@ enum ExtendedCommand {
     DotSection,
     VStem3,
     HStem3,
+    Seac = 6,
     Div = 12,
     CallOtherSubr = 16,
     Pop,
@@ -315,6 +316,7 @@ PDFErrorOr<PS1FontProgram::Glyph> PS1FontProgram::parse_glyph(ReadonlyBytes cons
                 case DotSection:
                 case VStem3:
                 case HStem3:
+                case Seac:
                     // FIXME: Do something with these?
                     state.sp = 0;
                     break;