Added clear event

ref #91

src/components/donations/AddDonationModal.svelte

@@ -221,7 +221,7 @@
                     placeholder={$_('search-for-donor-name-or-id')}
                     noOptionsMessage={$_('no-donors-found')}
                     on:select={(selectedValue) => (donor = selectedValue.detail.id)}
-                    on:clear={donor = null} />
+                    on:clear={()=>(donors = null)} />
                 </div>
                 {#if !is_fixed}
                   <div class="col-span-6">
@@ -238,7 +238,7 @@
                       placeholder={$_('search-for-runner-by-name-or-id')}
                       noOptionsMessage={$_('no-runners-found')}
                       on:select={(selectedValue) => (runner = selectedValue.detail.id)}
-                      on:clear={runner = null} />
+                      on:clear={()=>(runner = null)} />
                   </div>
                 {/if}
                 <div class="col-span-6">