crossing: Re-add crossing to all fields

This fixes "crossing: New approach with …`@templates/crossing/defaults`".

We need the "crossing" field on vertex/node fields as well to allow to quickly change the preset.

SQ

data/presets/highway/crossing.json

@@ -1,5 +1,6 @@
 {
     "fields": [
+        "crossing",
         "{@templates/crossing/defaults}",
         "{@templates/crossing/markings}",
         "tactile_paving"

data/presets/highway/crossing/_marked.json

@@ -1,6 +1,7 @@
 {
     "icon": "temaki-pedestrian_crosswalk",
     "fields": [
+        "crossing",
         "{@templates/crossing/markings}",
         "{@templates/crossing/defaults}",
         "tactile_paving"

data/presets/highway/crossing/_zebra.json

@@ -1,6 +1,7 @@
 {
     "icon": "temaki-pedestrian_crosswalk",
     "fields": [
+        "crossing",
         "{@templates/crossing/markings}",
         "{@templates/crossing/defaults}",
         "tactile_paving"

data/presets/highway/crossing/traffic_signals.json

@@ -1,6 +1,7 @@
 {
     "icon": "temaki-railway_signals",
     "fields": [
+        "crossing",
         "{@templates/crossing/traffic_signal}",
         "{@templates/crossing/markings}",
         "{@templates/crossing/defaults}",

data/presets/highway/crossing/uncontrolled.json

@@ -1,6 +1,7 @@
 {
     "icon": "temaki-pedestrian_crosswalk",
     "fields": [
+        "crossing",
         "{@templates/crossing/markings_yes}",
         "{@templates/crossing/defaults}",
         "tactile_paving"

data/presets/highway/crossing/unmarked.json

@@ -1,6 +1,7 @@
 {
     "icon": "temaki-pedestrian",
     "fields": [
+        "crossing",
         "{@templates/crossing/defaults}",
         "tactile_paving"
     ],