fix(Calendar): remove invalid error message for aborted requests

We abort requests if the underlying request data has changed, so there
is no need to handle the resulting AbortError instances as actual
errors.

refs #304

src/stores/program.ts

@@ -38,7 +38,7 @@ export function useProgramSlots(options: UseProgramOptions) {
   }))
 
   async function updateProgram() {
-    if (controller) controller.abort('date changed')
+    if (controller) controller.abort()
     error.value = undefined
     controller = new AbortController()
     isLoading.value = true
@@ -48,6 +48,7 @@ export function useProgramSlots(options: UseProgramOptions) {
         requestInit: { signal: controller.signal },
       })
     } catch (e) {
+      if (e instanceof DOMException && e.name === 'AbortError') return
       error.value = ensureError(e)
     } finally {
       isLoading.value = false