fix(igxGrid): Retain float value when measuring grid width so that there's no mismatch when zoomed out.

Author: MKirova

projects/igniteui-angular/src/lib/grids/grid-base.directive.ts

@@ -6302,7 +6302,7 @@ export abstract class IgxGridBaseDirective extends DisplayDensityBase implements
         if (this.isPercentWidth) {
             /* width in %*/
             const computed = this.document.defaultView.getComputedStyle(this.nativeElement).getPropertyValue('width');
-            width = computed.indexOf('%') === -1 ? parseInt(computed, 10) : null;
+            width = computed.indexOf('%') === -1 ? parseFloat(computed) : null;
         } else {
             width = parseInt(this.width, 10);
         }