refactor(icon-references): update icons in dropdown menus (#14829)

Author: simeonoff

projects/igniteui-angular/src/lib/icon/icon.references.ts

@@ -172,10 +172,6 @@ const loadIconRefs = () => [
     }),
     addIcon('input_expand', {
         default: {
-            name: 'arrow_drop_down',
-            family: 'material',
-        },
-        material: {
             name: 'expand_more',
             family: 'material',
         },
@@ -186,10 +182,6 @@ const loadIconRefs = () => [
     }),
     addIcon('input_collapse', {
         default: {
-            name: 'arrow_drop_up',
-            family: 'material',
-        },
-        material: {
             name: 'expand_less',
             family: 'material',
         },
@@ -200,9 +192,13 @@ const loadIconRefs = () => [
     }),
     addIcon('arrow_drop_down', {
         default: {
-            name: 'arrow_drop_down',
+            name: 'keyboard_arrow_down',
             family: 'material',
         },
+        indigo: {
+            name: 'chevron_down',
+            family: 'internal_indigo',
+        },
     }),
     addIcon('case_sensitive', {
         default: {