fix: remove unused refs on BCloseButton.

Author: phlegx

packages/bootstrap-vue-next/src/components/BAlert/BAlert.vue

@@ -15,7 +15,7 @@
         <BButton v-if="hasCloseSlot" v-bind="closeAttrs" @click="hide">
           <slot name="close" />
         </BButton>
-        <BCloseButton v-else ref="closeButton" v-bind="closeAttrs" @click="hide" />
+        <BCloseButton v-else v-bind="closeAttrs" @click="hide" />
       </template>
     </div>
   </BTransition>

packages/bootstrap-vue-next/src/components/BModal.vue

@@ -43,12 +43,7 @@
                   >
                     <slot name="header-close" />
                   </BButton>
-                  <BCloseButton
-                    v-else
-                    ref="closeButton"
-                    v-bind="headerCloseAttrs"
-                    @click="hide('close')"
-                  />
+                  <BCloseButton v-else v-bind="headerCloseAttrs" @click="hide('close')" />
                 </template>
               </slot>
             </div>

packages/bootstrap-vue-next/src/components/BOffcanvas/BOffcanvas.vue

@@ -38,12 +38,7 @@
                 <BButton v-if="hasHeaderCloseSlot" v-bind="headerCloseAttrs" @click="hide('close')">
                   <slot name="header-close" />
                 </BButton>
-                <BCloseButton
-                  v-else
-                  ref="closeButton"
-                  v-bind="headerCloseAttrs"
-                  @click="hide('close')"
-                />
+                <BCloseButton v-else v-bind="headerCloseAttrs" @click="hide('close')" />
               </template>
             </slot>
           </div>