cleanup(webconnectivitylte): remove the orig engine (#1455)

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)
 }