fix: return previous input on continue input error

this is basically 72973eade7
but it actually works and doesnt break everything
if an error occurred with the ContinuePrompt function (in this case,
the error is simply EOL/ctrl d) then return previous input alone

main.go

@@ -183,13 +183,14 @@ func main() {
 func ContinuePrompt(prev string) (string, error) {
 	hooks.Em.Emit("multiline", nil)
 	lr.SetPrompt(multilinePrompt)
+
 	cont, err := lr.Read()
 	if err != nil {
 		fmt.Println("")
-		return "", err
+		return prev, err
 	}
-	cont = strings.TrimSpace(cont)
 
+	cont = strings.TrimSpace(cont)
 	return prev + strings.TrimSuffix(cont, "\n"), nil
 }