feat(slider): Fix slider position inside grid cell

Closes #5973

Signed-off-by: MPopov <[email protected]>

Author: MPopov

projects/igniteui-angular/src/lib/core/styles/components/slider/_slider-theme.scss

@@ -128,6 +128,7 @@
         display: flex;
         position: relative;
         height: rem($slider-height);
+        flex-grow: 1;
         align-items: center;
         transition: all .2s $ease-out-quad;
 

projects/igniteui-angular/src/lib/slider/slider.component.ts

@@ -51,12 +51,7 @@ let NEXT_ID = 0;
 @Component({
     providers: [{ provide: NG_VALUE_ACCESSOR, useExisting: IgxSliderComponent, multi: true }],
     selector: 'igx-slider',
-    templateUrl: 'slider.component.html',
-    styles: [`
-        :host {
-            display: block;
-        }
-    `]
+    templateUrl: 'slider.component.html'
 })
 export class IgxSliderComponent implements
     ControlValueAccessor,