Don't set default value for internal kill switches

Bug: twpowertools:162
Change-Id: I2abef88edee996f4e8c76a717281604d2c67505a
diff --git a/src/common/optionsUtils.js b/src/common/optionsUtils.js
index d8045f6..bb0fab0 100644
--- a/src/common/optionsUtils.js
+++ b/src/common/optionsUtils.js
@@ -13,7 +13,8 @@
 
   var ok = true;
   for (const [opt, optMeta] of Object.entries(optionsPrototype)) {
-    if (!(opt in options)) {
+    if (!(opt in options) &&
+        optMeta['killSwitchType'] !== 'internalKillSwitch') {
       ok = false;
       options[opt] = optMeta['defaultValue'];
     }