Code Fix Provider for SA1402 adds extra space

[MattFromRVA]

While working on PR #3873 for #3109 I noticed the following errors when applying the original code fix for SA1402 for two edge cases.

If there are no using statements then a space is added between the namespace and the class in the new file:

namespace TestNamespace
{
    public class TestClass
    {
        public int MyProperty { get; set; }
    }

    public class TestClass2
    {
        public string MyProperty { get; set; }
    }
}

New File:

namespace TestNamespace
{

    public class TestClass2
    {
        public string MyProperty { get; set; }
    }
}

Similarly if there is a preprocessor directive with using statements then a space is added between the last using statement and the ending directive:

namespace TestNamespace
{
#if true
    using System;
#endif

    public class TestClass
    {
        public DateTime MyDate { get; set; }
    }

    public class TestClass2
    {
        public DateTime MyDate2 { get; set; }
    }
}

New File:

namespace TestNamespace
{
#if true
    using System;

#endif

    public class TestClass2
    {
        public DateTime MyDate2 { get; set; }
    }
}