fix(database): camelCase the connector name

[Atinux]

When using:

export default defineNitroConfig({
  experimental: {
    database: true
  },
  database: {
    default: {
      connector: "cloudflare-d1",
      options: {
        bindingName: "TEST"
      }
    }
  }
});

We had this error:

[nitro 6:40:47 PM]  ERROR  RollupError: Expected ',', got '-' (Note that you need plugins to import files that are not JavaScript)


1: 
2: import cloudflare-d1Connector from "db0/connectors/cloudflare-d1";
                    ^
3: 
4: export const connectionConfigs = {

Using camelCase from scule make sure to ovoid this error :)

Also add a PR to db0 to improve the error message too: unjs/db0#60