typos in dotnet facematch

[renatoaloi]

Purpose

• fixes for typos in dotnet/Face/FaceQuickstart.cs file preventing it to compile
• check for lenght before getting first index on Candidates array (BUG)

Does this introduce a breaking change?

[ X ] Yes
[ ] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ X ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone https://github.com/renatoaloi/cognitive-services-quickstart-code.git
cd cognitive-services-quickstart-code
git checkout master

• Create Dotnet Core 3.1 Console Application in Visual Studio
• copy dotnet/Face/FaceQuickstart.cs contents to Program.cs in de new created dotnet core application

• Test the code

• Run the project

What to Check

Project must runs without errors.

• ...

Other Information

• check for lenght buxfig wont make effect for the training photos, but it happens for other photos.

[ghost]

All CLA requirements met.