FIX: Compile issue on linux standalone (#760)

* FIX: Linux standalone can't build with Switch code.

* FIX: Replace standalone with win and osx for switch module.

Author: douglas-piconi

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -18,6 +18,7 @@ however, it has to be formatted properly to pass verification tests.
 - DualShock 3 on macOS:
   * Fixed actions bound to the dpad control performing correctly.
   * Fixed non-present touchpad button control being triggered incorrectly.
+- Fixed compile issues with switch classes on standalone Linux.
 
 #### Actions
 

Packages/com.unity.inputsystem/InputSystem/InputSystem.cs

@@ -2201,7 +2201,7 @@ private static void PerformDefaultPluginInitialization()
             WebGL.WebGLSupport.Initialize();
             #endif
 
-            #if UNITY_EDITOR || UNITY_SWITCH || UNITY_STANDALONE || UNITY_WSA
+            #if UNITY_EDITOR || UNITY_SWITCH || UNITY_STANDALONE_OSX || UNITY_STANDALONE_WIN || UNITY_WSA
             Switch.SwitchSupport.Initialize();
             #endif