Bug 1078306 - Add Windows 10 as supported OS version to SeaMonkey's exe manifest r=Neil

suite/app/seamonkey.exe.manifest

@@ -33,6 +33,7 @@
   </ms_asmv3:application>
   <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
     <application>
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
       <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
       <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
       <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>