codegen: PresignClient does not pass LogSigning option to signer

[jasdel]

Confirm by changing [ ] to [x] below to ensure that it's a bug:

• I've gone though the API reference
• I've checked AWS Forums and StackOverflow for answers
• I've searched for previous similar issues and didn't find any solution

Describe the bug
The generated PresignClients do not configure the LogSigning option of v4Signer.

aws-sdk-go-v2/service/s3/api_client.go

Lines 318 to 328 in 734d12f

	// NewPresignClient generates a presign client using provided API Client and
	// presign options
	func NewPresignClient(c *Client, optFns ...func(*PresignOptions)) *PresignClient {
	var presignOptions PresignOptions
	for _, fn := range optFns {
	fn(&presignOptions)
	}
	client := copyAPIClient(c, presignOptions.ClientOptions...)
	if presignOptions.Presigner == nil {
	presignOptions.Presigner = v4.NewSigner()
	}

Version of AWS SDK for Go?
v0.30.0

Version of Go (go version)?
v1.15.5

To Reproduce (observed behavior)

	client := s3.NewFromConfig(cfg, func(o *s3.Options) {
		o.ClientLogMode |= aws.LogSigning
	})
	// or
	p := s3.NewPresignClient(client, func(o *s3.PresignOptions) {
		o.ClientOptions = append(o.ClientOptions, func(o *s3.Options) {
			o.ClientLogMode |= aws.LogSigning
		})
	})

Expected behavior

@@ -317,14 +319,17 @@ type PresignClient struct {

 // NewPresignClient generates a presign client using provided API Client and
 // presign options
-func NewPresignClient(c *Client, optFns ...func(*PresignOptions)) *PresignClient {
+func NewPresignClient(client *Client, optFns ...func(*PresignOptions)) *PresignClient {
        var presignOptions PresignOptions
        for _, fn := range optFns {
                fn(&presignOptions)
        }
-       client := copyAPIClient(c, presignOptions.ClientOptions...)
+       client = copyAPIClient(client, presignOptions.ClientOptions...)
        if presignOptions.Presigner == nil {
-               presignOptions.Presigner = v4.NewSigner()
+               presignOptions.Presigner = v4.NewSigner(func(s *v4.Signer) {
+                       s.LogSigning = client.options.ClientLogMode.IsSigning()
+               })
        }

Additional context
Add any other context about the problem here.

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