feat(IgxGridBaseDirective): fix copying when copyHeaders is disabled

Author: katherinedragieva

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

@@ -5544,13 +5544,11 @@ export abstract class IgxGridBaseDirective extends DisplayDensityBase implements
 
         if (!this.clipboardOptions.copyHeaders) {
             result = result.substring(result.indexOf('\n') + 1);
-        }
-
-        if (Object.values(data[0]).length === 1) {
-            result = result.slice(0, -2);
-            if (!this.clipboardOptions.copyHeaders) {
+            if (Object.values(data[0]).length === 1) {
                 result = result.substring(data[0], result.indexOf('\n'));
             }
+        } else if (Object.values(data[0]).length === 1 && this.clipboardOptions.copyHeaders) {
+            result = result.slice(0, -2);
         }
 
         event.preventDefault();