remove opening_hours:covid19 field, closes #963

follows #401

data/presets/barrier/gate.json

@@ -11,7 +11,6 @@
     "moreFields": [
         "colour",
         "manufacturer",
-        "opening_hours/covid19",
         "operator",
         "ref"
     ],

data/presets/barrier/lift_gate.json

@@ -7,8 +7,7 @@
         "opening_hours"
     ],
     "moreFields": [
-        "{barrier}",
-        "opening_hours/covid19"
+        "{barrier}"
     ],
     "geometry": [
         "vertex"

data/presets/barrier/toll_booth.json

@@ -9,8 +9,7 @@
     "moreFields": [
         "{@templates/contact}",
         "address",
-        "opening_hours",
-        "opening_hours/covid19"
+        "opening_hours"
     ],
     "geometry": [
         "vertex",