Put back normalization in update script with a note about YunoHost 2.7

scripts/upgrade

@@ -64,6 +64,18 @@ ynh_clean_setup () {
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
+#=================================================
+# CHECK THE PATH
+#=================================================
+
+# Normalize the URL path syntax
+# N.B. : this is for app installations before YunoHost 2.7
+# where this value might be something like /foo/ or foo/
+# instead of /foo ....
+# If nobody installed your app before 2.7, then you may
+# safely remove this line
+path_url=$(ynh_normalize_url_path $path_url)
+
 #=================================================
 # STANDARD UPGRADE STEPS
 #=================================================