Fix closing tag check.

Author: timcassell

src/BenchmarkDotNet/Toolchains/CsProj/CsProjGenerator.cs

@@ -150,10 +150,16 @@ private static void AppendPackageReference(string line, StringBuilder stringBuil
             do
             {
                 stringBuilder.AppendLine(line);
+                line = RemoveAllWhiteSpace(line);
             }
-            while (!line.EndsWith("\" />") && !line.EndsWith("</PackageReference>") && (line = streamReader.ReadLine()) != null);
+            while (!line.EndsWith("/>") && !line.EndsWith("</PackageReference>") && (line = streamReader.ReadLine()) != null);
         }
 
+        private static string RemoveAllWhiteSpace(string value)
+            => new string(value.ToCharArray()
+                .Where(c => !char.IsWhiteSpace(c))
+                .ToArray());
+
         /// <summary>
         /// returns a path to the project file which defines the benchmarks
         /// </summary>