better PID environment variable handling.

NzbDrone.App.Test/IISProviderFixture.cs

@@ -16,13 +16,13 @@ namespace NzbDrone.App.Test
     public class IISProviderFixture : TestBase
     {
         [Test]
-        public void should_not_set_env_varibles_twice()
+        public void should_update_pid_env_varibles()
         {
             WithTempAsAppPath();
 
             var dummy = StartDummyProcess();
 
-            Environment.SetEnvironmentVariable(EnviromentProvider.NZBDRONE_PID, "Test");
+            Environment.SetEnvironmentVariable(EnviromentProvider.NZBDRONE_PID, "0");
             Environment.SetEnvironmentVariable(EnviromentProvider.NZBDRONE_PATH, "Test");
 
             Mocker.GetMock<ProcessProvider>()

NzbDrone/Providers/IISProvider.cs

@@ -53,15 +53,9 @@ namespace NzbDrone.Providers
             startInfo.RedirectStandardError = true;
             startInfo.CreateNoWindow = true;
 
-            if (!startInfo.EnvironmentVariables.ContainsKey(EnviromentProvider.NZBDRONE_PATH))
-            {
-                startInfo.EnvironmentVariables.Add(EnviromentProvider.NZBDRONE_PATH, _enviromentProvider.ApplicationPath);
-            }
 
-            if (!startInfo.EnvironmentVariables.ContainsKey(EnviromentProvider.NZBDRONE_PID))
-            {
-                startInfo.EnvironmentVariables.Add(EnviromentProvider.NZBDRONE_PID, Process.GetCurrentProcess().Id.ToString());
-            }
+            startInfo.EnvironmentVariables[EnviromentProvider.NZBDRONE_PATH] = _enviromentProvider.ApplicationPath;
+            startInfo.EnvironmentVariables[EnviromentProvider.NZBDRONE_PID] = Process.GetCurrentProcess().Id.ToString();
 
             try
             {