fix: ability to clear reply-to and from name from templates and campaigns

apps/web/src/pages/campaigns/[id].tsx

@@ -213,8 +213,8 @@ export default function CampaignDetailsPage() {
         subject: editedCampaign.subject,
         body: editedCampaign.body,
         from: editedCampaign.from,
-        fromName: editedCampaign.fromName || undefined,
-        replyTo: editedCampaign.replyTo || undefined,
+        fromName: editedCampaign.fromName || null,
+        replyTo: editedCampaign.replyTo || null,
         audienceType: editedCampaign.audienceType,
         segmentId: editedCampaign.segmentId || undefined,
       });

apps/web/src/pages/campaigns/create.tsx

@@ -64,8 +64,8 @@ export default function CreateCampaignPage() {
         subject,
         body,
         from,
-        fromName: fromName || undefined,
-        replyTo: replyTo || undefined,
+        fromName: fromName || null,
+        replyTo: replyTo || null,
         audienceType,
         segmentId: audienceType === CampaignAudienceType.SEGMENT ? segmentId : undefined,
         audienceFilter: audienceType === CampaignAudienceType.FILTERED ? [] : undefined,