AK+Everywhere: Make GenericLexer::ignore_until() stop before the value

`consume_until(foo)` stops before foo, and so does
`ignore_until(Predicate)`, so let's make the other `ignore_until()`
overloads consistent with that so they're less confusing.

Userland/Libraries/LibCpp/Preprocessor.cpp

@@ -72,21 +72,24 @@ static void consume_whitespace(GenericLexer& lexer)
                 lexer.ignore(2);
             } else {
                 lexer.ignore_until('\n');
+                lexer.ignore();
                 break;
             }
         }
     };
     for (;;) {
-        if (lexer.consume_specific("//"sv))
+        if (lexer.consume_specific("//"sv)) {
             ignore_line();
-        else if (lexer.consume_specific("/*"sv))
+        } else if (lexer.consume_specific("/*"sv)) {
             lexer.ignore_until("*/");
-        else if (lexer.next_is("\\\n"sv))
             lexer.ignore(2);
-        else if (lexer.is_eof() || !lexer.next_is(isspace))
+        } else if (lexer.next_is("\\\n"sv)) {
+            lexer.ignore(2);
+        } else if (lexer.is_eof() || !lexer.next_is(isspace)) {
             break;
-        else
+        } else {
             lexer.ignore();
+        }
     }
 }
 

Userland/Libraries/LibWeb/MimeSniff/MimeType.cpp

@@ -139,10 +139,7 @@ Optional<MimeType> MimeType::from_string(StringView string)
             parameter_value = Fetch::Infrastructure::collect_an_http_quoted_string(lexer, Fetch::Infrastructure::HttpQuotedStringExtractValue::Yes);
 
             // 2. Collect a sequence of code points that are not U+003B (;) from input, given position.
-            // NOTE: This uses the predicate version as the ignore_until(char) version will also ignore the ';'.
-            lexer.ignore_until([](char ch) {
-                return ch == ';';
-            });
+            lexer.ignore_until(';');
         }
 
         // 9. Otherwise: