fix(time-picker): remove redundant styles (#16419)

Author: SisIvanova

projects/igniteui-angular/src/lib/core/styles/components/time-picker/_time-picker-theme.scss

@@ -23,21 +23,6 @@
         'indigo': rem(16px),
     ), $variant);
 
-    .igx-input-group {
-        display: flex;
-        flex-direction: column;
-
-        @if $variant == 'indigo' or $variant == 'bootstrap' {
-            [igxLabel] {
-                margin-block-end: rem(4px);
-            }
-        } @else if $variant == 'fluent' {
-            [igxLabel] {
-                margin-block-end: rem(5px);
-            }
-        }
-    }
-
     %time-picker-display {
         @include sizable();