Added cancel button for the first stage of runner import

ref #112

src/components/runners/ImportRunnerModal.svelte

@@ -281,6 +281,16 @@
                   bind:files
                   type="file" />
               </div>
+              <div class="overflow-hidden relative mt-4 mb-4">
+                <button
+                  on:click={() => {
+                    cancelModal();
+                  }}
+                  type="button"
+                  class="w-full rounded-md border border-transparent shadow-sm px-4 py-2 bg-red-600 text-base font-medium text-white hover:bg-red-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-red-500 md:ml-40 mr-0 sm:ml-0 sm:w-auto sm:text-sm">
+                  {$_('cancel')}
+                </button>
+              </div>
             {/if}
             {#if json_output.length > 0}
               {#if opened_from === 'OrgOverview'}