arm-ttk does not flag default passwords

**arm-ttk version:** 0.24
**Scenarios:**

1. A PasswordBox control has its `defaultValue` set to a certain value.
2. A CredentialsCombo (Windows or Linux) control has its `defaultValue.password` set to a certain value.

**Problem:** arm-ttk does not flag the default password scenarios like it does with the UserNameTextBox even though the default password instances are far more dangerous than the default username.

**Sample CUID:**

```
{
"$schema": "https://schema.management.azure.com/schemas/0.1.2-preview/CreateUIDefinition.MultiVm.json#",
"handler": "Microsoft.Azure.CreateUIDef",
"version": "0.1.2-preview",
"parameters": {
"basics": [
{
"constraints": {
"regex": "^[a-zA-Z0-9]{12,}$",
"validationMessage": "Password must be at least 12 characters long, contain only numbers and letters."
},
"defaultValue": "ThisIsADefaultPAssword",
"label": {
"confirmPassword": "Confirm password",
"password": "Password"
},
"name": "PasswordBox1",
"toolTip": "Enter a value.",
"type": "Microsoft.Common.PasswordBox"
},
{
"defaultValue": {
"authenticationType": "password",
"password": "!ThisIsALinuxDefaultPassword1"
},
"label": {
"authenticationType": "Authentication type",
"confirmPassword": "Confirm password",
"exisitingKeyDropdown": "Stored Keys",
"keyPairName": "Key pair name",
"password": "Password",
"sshKeySourceDropdown": "SSH public key source",
"sshPublicKey": "SSH Public Key"
},
"name": "CredentialsComboLinux1",
"osPlatform": "Linux",
"toolTip": {
"authenticationType": "Select authentication type.",
"password": "Enter password.",
"sshPublicKey": "Specify SSH Public Key."
},
"type": "Microsoft.Compute.CredentialsCombo"
},
{
"defaultValue": {
"password": "!ThisIsAWindowsDefaultPassword1"
},
"label": {
"confirmPassword": "Confirm password",
"password": "Password"
},
"name": "CredentialsComboWindows1",
"osPlatform": "Windows",
"toolTip": {
"password": "Enter password."
},
"type": "Microsoft.Compute.CredentialsCombo"
}
],
"steps": [],
"outputs": {
"location": "[location()]",
"Password1": "[basics('PasswordBox1')]",
"Password2": "[basics('CredentialsComboLinux1').password]",
"Password3": "[basics('CredentialsComboWindows1').password]"
}
},
"metadata": {
"_generator": {
"name": "MaestroStudio",
"sku": "Solo",
"version": "0.9.0.0",
"template": {
"author": "StratusOn",
"id": "EA622966-CE0C-46E7-841B-73C2E6ED5DEB",
"description": "A blank Azure Marketplace Managed Application offer."
}
},
"_sync": {
"offer": {
"displayName": "My Offer"
},
"plan": {
"displayName": "Plan"
}
}
}
}
```