chore(combo): Removing unnecessary code

Author: Ivan Kitanov

CHANGELOG.md

@@ -48,13 +48,6 @@ All notable changes for each version of this project will be documented in this
     </igx-grid>
     ```
 
-## 19.2.14
-### General
-- `IgxSimpleCombo`
-    - Added `disableFiltering` to the `IgxSimpleCombo`, which enables/disables the filtering in the list. The default is `false`. With this introduction, `filteringOptions.filterable` is no longer usde.
-- `IgxCombo`, `IgxSimpleCombo`
-    -  Removed deprecated `filteringOptions.filterable` option.
-
 ## 19.2.0
 ### General
 - `IgxCarousel`