Setup provider using the provider key

Fixes nuxt#1414

src/provider.ts

@@ -137,12 +137,13 @@ export async function resolveProvider(_nuxt: any, key: string, input: InputProvi
   }
 
   const resolver = createResolver(import.meta.url)
+
+  const setup = input.setup || providerSetup[input.provider as ImageProviderName] || providerSetup[input.name as ImageProviderName]
+
   input.provider = BuiltInProviders.includes(input.provider as ImageProviderName)
     ? await resolver.resolve('./runtime/providers/' + input.provider)
     : await resolvePath(input.provider)
 
-  const setup = input.setup || providerSetup[input.name as ImageProviderName]
-
   return <ImageModuleProvider> {
     ...input,
     setup,