add oneway field to Tram Track preset

see https://taginfo.openstreetmap.org/tags/railway=tram#combinations and https://wiki.openstreetmap.org/w/index.php?title=Tag:railway%3Dtram&oldid=2321471

data/presets/railway/tram.json

@@ -1,7 +1,8 @@
 {
     "icon": "temaki-tram",
     "fields": [
-        "{railway/light_rail}"
+        "{railway/light_rail}",
+        "oneway"
     ],
     "moreFields": [
         "{railway/light_rail}"