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">

src/components/donations/DonationDetail.svelte

@@ -220,7 +220,7 @@
         noOptionsMessage={$_('no-donors-found')}
         selectedValue={current_donors.find((d) => (d.id == editable.donor))}
         on:select={(selectedValue) => (editable.donor = selectedValue.detail.id)}
-        on:clear={editable.donor = null}/>
+        on:clear={()=>(editable.donor = null)}/>
     </div>
     {#if original_data.responseType == 'DISTANCEDONATION'}
       <div class=" w-full">
@@ -238,7 +238,7 @@
           noOptionsMessage={$_('no-runners-found')}
           selectedValue={undefined || current_runners.find((r) => (r.id = original_data.runner.id))}
           on:select={(selectedValue) => (editable.runner == selectedValue.detail.id)}
-          on:clear={editable.runner = null} />
+          on:clear={()=>(editable.runner = null)} />
       </div>
     {/if}
     <div class=" w-full">