TextEditor: Fix highlighting bug in wrapping mode

Before this patch the highlighted rectangle wasn't placed on the right
spot. Now the red highlighting is correctly placed at the end of the
line. This was due to a function called with a wrong argument.

Userland/Libraries/LibGUI/TextEditor.cpp

@@ -652,7 +652,7 @@ void TextEditor::paint_event(PaintEvent& event)
                 if (physical_column < end_of_visual_line) {
                     size_t visual_column = physical_column > start_of_visual_line ? (physical_column - start_of_visual_line) : 0;
                     Gfx::IntRect whitespace_rect {
-                        content_x_for_position({ line_index, visual_column }),
+                        content_x_for_position({ line_index, physical_column }),
                         visual_line_rect.y(),
                         text_width_for_font(visual_line_text.substring_view(visual_column, visual_line_text.length() - visual_column), font()),
                         visual_line_rect.height()