fix(api): drop the block-data error flag from the workflow contract

Left behind by the consolidation: the flag no longer lives in `data`, and a
schema that still declares it there invites the mirror back through the wire.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: icecrasher321

apps/sim/lib/api/contracts/workflows.ts

@@ -41,7 +41,6 @@ const workflowBlockDataSchema = z.object({
   batchSize: z.number().optional(),
   type: z.string().optional(),
   canonicalModes: z.record(z.string(), z.enum(['basic', 'advanced'])).optional(),
-  errorEnabled: z.boolean().optional(),
 })
 
 const workflowSubBlockStateSchema = z.object({