cleanup(webconnectivitylte): remove the orig engine

This commit removes the "orig" data analysis engine of the
webconnectivitylte experiment now that the "classic" engine
is able to generate the same or better results.

Part of ooni/probe#2640

internal/experiment/webconnectivitylte/analysisclassic.go

@@ -14,10 +14,10 @@ import (
 	"github.com/ooni/probe-cli/v3/internal/runtimex"
 )
 
-// AnalysisEngineClassic is an alternative analysis engine that aims to produce
+// analysisEngineClassic is an alternative analysis engine that aims to produce
 // results that are backward compatible with Web Connectivity v0.4 while also
 // procuding more fine-grained blocking flags.
-func AnalysisEngineClassic(tk *TestKeys, logger model.Logger) {
+func analysisEngineClassic(tk *TestKeys, logger model.Logger) {
 	tk.analysisClassic(logger)
 }