Revert "Update vifib email constraint validation method."

This reverts commit 3326057a.

Conflicts:

	master/bt5/vifib_erp5/bt/revision

master/bt5/vifib_erp5/PropertySheetTemplateItem/portal_property_sheets/VifibEmailConstraint/email_not_empty_constraint.xml

@@ -39,7 +39,7 @@
             <key> <string>constraint_property</string> </key>
             <value>
               <tuple>
-                <string>coordinate_text</string>
+                <string>url_string</string>
               </tuple>
             </value>
         </item>

master/bt5/vifib_erp5/PropertySheetTemplateItem/portal_property_sheets/VifibEmailConstraint/email_unicity_constraint.xml

@@ -22,7 +22,7 @@
             <key> <string>constraint_property</string> </key>
             <value>
               <tuple>
-                <string>coordinate_text</string>
+                <string>url_string</string>
               </tuple>
             </value>
         </item>

master/bt5/vifib_erp5/bt/revision

-231
+232