tests/resource/aws_iam_user_login_profile: Remove usage of acctest.RandIntRange()
tests/resource/aws_iam_user_login_profile: Remove usage of acctest.RandIntRange()

Not sure why it would generate an integer outside its defined range, but we also do not need a random integer for this test.

Previously:

```
--- FAIL: TestAccAWSUserLoginProfile_PasswordLength (0.50s)
    testing.go:527: Step 0 error: config is invalid: aws_iam_user_login_profile.user: expected password_length to be in the range (5 - 128), got 1
```

Now:

```
--- PASS: TestAccAWSUserLoginProfile_PasswordLength (13.13s)
```

Ninir/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,Ninir/terraform-provider-aws,kjmkznr/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,Ninir/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,Ninir/terraform-provider-aws,kjmkznr/terraform-provider-aws