fix: Remove unnecessary blank line in _CodeFieldRenderer class

Author: heckmon

lib/code_forge/code_area.dart

@@ -3537,14 +3537,14 @@ class _CodeFieldRenderer extends RenderBox implements MouseTrackerAnnotation {
   final Map<int, FoldRange?> _foldRanges = {};
   final Map<int, int?> _bracketCache = {};
 
-
   void _invalidateFoldRanges([int startLine = 0]) {
     if (startLine <= 0) {
       _foldRanges.clear();
     } else {
       _foldRanges.removeWhere((key, _) => key >= startLine);
     }
   }
+
   final Map<
     int,
     List<({int startLine, int endLine, int indentLevel, double guideX})>