Add camelcase conversion to tableName in mergeNested.ts

[hammo92]

Camelcase conversion was missing in the merge nested function leading to incorrect naming:

//_generated/belongsTo/belongsToSchemaGen.ts
export const belongs_toInputSchemaGen = z.object({}).passthrough();

//schema/belongsTo/belongsToSchema.ts
import { belongsToInputSchemaGen, belongsToOutputSchemaGen } from "../../_generated/belongsTo/belongsToSchemaGen.js";