Clean up module install code

Having a global reference for InstallModuleChildProcess isn't actually required since this is javascript.
Take the substring that doesn't include the version tag, so "require" can find the module
Fixes #631

package.json

@@ -1,6 +1,6 @@
 {
   "name": "meshcentral",
-  "version": "0.4.3-v",
+  "version": "0.4.3-w",
   "keywords": [
     "Remote Management",
     "Intel AMT",