LibPDF: Allow numbers to start with whitespace

Author: https://github.com/janso3
Commit: https://github.com/SerenityOS/serenity/commit/a37f3390dc
Pull-request: https://github.com/SerenityOS/serenity/pull/16933
Reviewed-by: https://github.com/nico

Userland/Libraries/LibPDF/Parser.cpp

@@ -170,6 +170,8 @@ PDFErrorOr<NonnullRefPtr<IndirectValue>> Parser::parse_indirect_value()
 
 PDFErrorOr<Value> Parser::parse_number()
 {
+    m_reader.consume_whitespace();
+
     size_t start_offset = m_reader.offset();
     bool is_float = false;
     bool consumed_digit = false;