fix: Don't try to index AppMaps when inspecting

Don't try to invoke "@appland/appmap index" as part of
"exe/appmap-inspect". Indexing needs to be invoked separately, which
allows the user to pass it the correct arguments (e.g. "--appmap-dir").

Author: apotterri

lib/appmap/command/inspect.rb

@@ -13,7 +13,6 @@ def run
 
       def inspect(arguments)
         detect_nodejs
-        index_appmaps
 
         arguments.unshift 'inspect'
         arguments.unshift APPMAP_JS