Add case insensitive sort option for keywords (#3028)

Closes #2521

Co-authored-by: Hélio Guilherme <helioxentric@gmail.com>

Author: chelslava

src/robotide/controller/ctrlcommands.py

@@ -465,6 +465,7 @@ def __init__(self, case_insensitive=False):
 
     def _execute(self, context):
         index_difference = context.sort_keywords(case_insensitive=self._case_insensitive)
+
         self._undo_command = RestoreKeywordOrder(index_difference, self._case_insensitive)
 
     def _get_undo_command(self):