Disable py launcher by default in the Windows installer

Summary:
we deploy an official upstream py launcher separately.
it's deployed under `C:\Windows`, so it's important that it has valid signatures (which our build does not).
to avoid the managed cpython installation from "hijacking" the launcher, this makes the launcher feature disabled by default in the managed installer.

Reviewed By: zsol

Differential Revision: D55898720

fbshipit-source-id: 2d5eb2508227e85ef1043d581c04faa31f86f245

Tools/msi/bundle/bundle.wxs

@@ -57,11 +57,7 @@
     <Variable Name="DefaultCustomTargetDir" Value="" bal:Overridable="yes" />
 
     <Variable Name="InstallAllUsersState" Value="enabled" bal:Overridable="yes" />
-    <?if "$(var.PyTestExt)"="" ?>
-    <Variable Name="InstallLauncherAllUsersState" Value="enabled" bal:Overridable="yes" />
-    <?else ?>
     <Variable Name="InstallLauncherAllUsersState" Value="disable" bal:Overridable="yes" />
-    <?endif ?>
     <Variable Name="CustomInstallLauncherAllUsersState" Value="[InstallLauncherAllUsersState]" />
     <Variable Name="TargetDirState" Value="enabled" />
     <Variable Name="CustomBrowseButtonState" Value="enabled" />
@@ -76,11 +72,7 @@
     <Variable Name="Include_tcltk" Value="0" bal:Overridable="yes" />
     <Variable Name="Include_pip" Value="0" bal:Overridable="yes" />
     <Variable Name="Include_launcher" Value="-1" bal:Overridable="yes" />
-    <?if "$(var.PyTestExt)"="" ?>
-    <Variable Name="Include_launcherState" Value="enabled" bal:Overridable="yes" />
-    <?else ?>
     <Variable Name="Include_launcherState" Value="disable" />
-    <?endif ?>
     <Variable Name="Include_symbols" Value="0" bal:Overridable="yes" />
     <Variable Name="Include_debug" Value="0" bal:Overridable="yes" />