Fix missing usings after merge

Author: MDoerner

Rubberduck.Refactorings/ImplementInterface/AddInterfaceImplementations/AddInterfaceImplementationsRefactoringAction.cs

@@ -5,7 +5,6 @@
 using Rubberduck.Parsing.Rewriter;
 using Rubberduck.Parsing.Symbols;
 using Rubberduck.Refactorings.Common;
-using Rubberduck.Refactorings.ImplementInterface;
 
 namespace Rubberduck.Refactorings.AddInterfaceImplementations
 {

RubberduckTests/Refactoring/EncapsulateField/EncapsulateArrayFieldTests.cs

@@ -1,4 +1,5 @@
-using NUnit.Framework;
+using System;
+using NUnit.Framework;
 using Rubberduck.Parsing.Rewriter;
 using Rubberduck.Parsing.Symbols;
 using Rubberduck.Parsing.VBA;