show crossing field on all crossing presets

to allow switching between the different crossing presets more easily (e.g. from "crossing=unmarked" to "crossing=traffic_signals") without having to open the preset selector UI again

see https://github.com/openstreetmap/id-tagging-schema/pull/590#discussion_r979271240

data/presets/highway/crossing/traffic_signals.json

@@ -1,6 +1,7 @@
 {
     "icon": "temaki-railway_signals",
     "fields": [
+        "crossing",
         "tactile_paving",
         "crossing/island",
         "crossing/markings",

data/presets/highway/crossing/uncontrolled.json

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

data/presets/highway/crossing/unmarked.json

@@ -1,6 +1,7 @@
 {
     "icon": "temaki-pedestrian",
     "fields": [
+        "crossing",
         "tactile_paving",
         "crossing/island",
         "crossing_raised"

data/presets/highway/cycleway/crossing/uncontrolled.json

@@ -1,6 +1,7 @@
 {
     "icon": "temaki-cyclist_crosswalk",
     "fields": [
+        "crossing",
         "surface",
         "tactile_paving",
         "crossing/island",

data/presets/highway/footway/crossing/traffic_signals.json

@@ -1,6 +1,7 @@
 {
     "icon": "temaki-railway_signals",
     "fields": [
+        "crossing",
         "surface",
         "tactile_paving",
         "crossing/island",

data/presets/highway/footway/crossing/uncontrolled.json

@@ -1,6 +1,7 @@
 {
     "icon": "temaki-pedestrian",
     "fields": [
+        "crossing",
         "surface",
         "tactile_paving",
         "crossing/island",

data/presets/highway/footway/crossing/unmarked.json

@@ -1,6 +1,7 @@
 {
     "icon": "temaki-pedestrian",
     "fields": [
+        "crossing",
         "surface",
         "tactile_paving",
         "crossing/island",