Prevent rewrites adding continous extra linefeeds

Previously when a rewriter would perform its rewrite, an extra linefeed
was added. This comes about because when the last line in a module is
replaced in the VBA IDE an extra linefeed is added.

Author: IvenBach

Rubberduck.Parsing/Rewriter/ModuleRewriter.cs

@@ -33,7 +33,14 @@ public void Rewrite()
                 return;
             }
 
-            var newCode = _rewriter.GetText();
+            var tentativeCode = _rewriter.GetText();
+
+            while (tentativeCode.EndsWith(Environment.NewLine))
+            {
+                tentativeCode = tentativeCode.Remove(tentativeCode.Length - 2);
+            };
+            var newCode = tentativeCode;
+
             _sourceCodeHandler.SubstituteCode(_module, newCode);
         }