Fix 3 Style issues in multiple files

[Egor92]

CodeFactor found multiple issues last seen at 5e6d159:

An opening curly bracket must not be preceded by a blank line.

code\test\UINavigation.ContractTests\InternalTests\DataStorageTestsBase.cs:11

The code must not contain multiple blank lines in a row.

samples\SinglePageApp\Properties\AssemblyInfo.cs:21
samples\RestaurantApp\Properties\AssemblyInfo.cs:21