remove opening_hours:covid19 field, closes #963

follows #401

data/presets/highway/elevator.json

@@ -12,8 +12,7 @@
         "dog",
         "manufacturer",
         "maxheight",
-        "opening_hours",
-        "opening_hours/covid19"
+        "opening_hours"
     ],
     "geometry": [
         "vertex",

data/presets/highway/rest_area.json

@@ -12,7 +12,6 @@
         "bin",
         "caravans",
         "drinking_water_available",
-        "opening_hours/covid19",
         "picnic_table",
         "toilets",
         "wheelchair"

data/presets/highway/toll_gantry.json

@@ -13,9 +13,7 @@
         "opening_hours",
         "payment_multi"
     ],
-    "moreFields": [
-        "opening_hours/covid19"
-    ],
+    "moreFields": [],
     "geometry": [
         "vertex"
     ],

data/presets/highway/trailhead.json

@@ -12,8 +12,7 @@
     ],
     "moreFields": [
         "gnis/feature_id-US",
-        "opening_hours",
-        "opening_hours/covid19"
+        "opening_hours"
     ],
     "geometry": [
         "vertex"