MAINT-6998 [Project Alex Ivy] 64bit viewer installs to Program Files (x86) by...

MAINT-6998 [Project Alex Ivy] 64bit viewer installs to Program Files (x86) by default. (Update2: evidently the registry set call is needed on un.init() too

indra/newview/installers/windows/installer_template.nsi

@@ -195,6 +195,7 @@ FunctionEnd
 ;; Prep Uninstaller Section
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 Function un.onInit
+%%ENGAGEREGISTRY%%
 # Read language from registry and set for uninstaller. Key will be removed on successful uninstall
 	ReadRegStr $0 HKEY_LOCAL_MACHINE "SOFTWARE\Linden Research, Inc.\${INSTNAME}" "InstallerLanguage"
     IfErrors lbl_end