LibPDF: Fix checking minor_ver instead of major_ver

Author: https://github.com/InusualZ 🔰
Commit: 5d4d70355e
Pull-request: https://github.com/SerenityOS/serenity/pull/8763
Reviewed-by: https://github.com/mattco98 ✅

Userland/Libraries/LibPDF/Parser.cpp

@@ -95,7 +95,7 @@ bool Parser::parse_header()
         return false;
 
     char minor_ver = m_reader.read();
-    if (minor_ver < '0' || major_ver > '7')
+    if (minor_ver < '0' || minor_ver > '7')
         return false;
     consume_eol();