docs: use default ariaAttachAs in Storybook demos

Author: mdeanjones

addon/components/ui-popover/ui-popover.stories.ts

@@ -28,7 +28,6 @@ const Template = (context: unknown) => {
             Log In
             <UiPopover
               @title={{this.title}}
-              @ariaAttachAs={{this.ariaAttachAs}}
               @autoPlacement={{this.autoPlacement}}
               @delay={{this.delay}}
               @distance={{this.distance}}

addon/components/ui-tooltip/ui-tooltip-attachment.stories.ts

@@ -18,7 +18,6 @@ const Template = (context: unknown) => {
       <button class="btn btn-default">
         Click Here <UiIcon @name="question-circle" />
         <UiTooltipAttachment
-          @ariaAttachAs={{this.ariaAttachAs}}
           @ariaHidden={{this.ariaHidden}}
           @ariaLabel={{this.ariaLabel}}
           @ariaSelector={{this.ariaSelector}}

addon/components/ui-tooltip/ui-tooltip.stories.ts

@@ -16,7 +16,6 @@ const Template = (context: unknown) => {
     // language=handlebars
     template: hbs`
       <UiTooltip
-        @ariaAttachAs={{this.ariaAttachAs}}
         @ariaHidden={{this.ariaHidden}}
         @ariaLabel={{this.ariaLabel}}
         @ariaSelector={{this.ariaSelector}}