add "toilets:menstrual_products" field also to pois with toilet tag

see #1116

data/fields/toilets/menstrual_products_poi.json

@@ -0,0 +1,10 @@
+{
+    "key": "toilets:menstrual_products",
+    "type": "radio",
+    "stringsCrossReference": "{toilets/menstrual_products}",
+    "label": "{toilets/menstrual_products}",
+    "prerequisiteTag": {
+        "key": "toilets",
+        "valueNot": "no"
+    }
+}