WiX: package SwiftSDKCommand.dll for SPM

Add missing `SwiftSDKCommand.dll` to the SPM distribution on Windows. This is required for the `swift sdk` command to function.

Author: Steelskin

platforms/Windows/cli/cli.wxs

@@ -708,6 +708,9 @@
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\SPMBuildCore.dll" />
       </Component>
+      <Component>
+        <File Source="$(ToolchainRoot)\usr\bin\SwiftSDKCommand.dll" />
+      </Component>
       <Component>
         <File Source="$(ToolchainRoot)\usr\bin\Workspace.dll" />
       </Component>