crossing: Add kerb to all vertex crossings

The convention is, to tag this on the node _and_/_or_ on the separate `barrier=kerb+kerb=*` node when the path is mapped separately.
It should be part of all crossing vertex presets.

Author: tordans

data/presets/highway/crossing/_marked.json

@@ -5,6 +5,9 @@
         "{@templates/crossing/markings}",
         "crossing_raised"
     ],
+    "moreFields": [
+        "kerb"
+    ],
     "geometry": [
         "vertex"
     ],

data/presets/highway/crossing/_zebra.json

@@ -5,6 +5,9 @@
         "{@templates/crossing/markings}",
         "crossing_raised"
     ],
+    "moreFields": [
+        "kerb"
+    ],
     "geometry": [
         "vertex"
     ],

data/presets/highway/crossing/uncontrolled.json

@@ -5,6 +5,9 @@
         "{@templates/crossing/markings_yes}",
         "crossing_raised"
     ],
+    "moreFields": [
+        "kerb"
+    ],
     "geometry": [
         "vertex"
     ],

data/presets/highway/crossing/unmarked.json

@@ -4,6 +4,9 @@
         "{@templates/crossing/defaults}",
         "crossing_raised"
     ],
+    "moreFields": [
+        "kerb"
+    ],
     "geometry": [
         "vertex"
     ],