Landuse flowerbed to landcover (#198)

* we are now past 3.15 so we're going to follow master

* regenerate-openmaptiles.sh b3d67ed5b327c9059aeea0b3304772c6b4c8c7e9  (to match content of OMT PR 1661)

src/main/java/org/openmaptiles/generated/Tables.java

@@ -50,7 +50,7 @@ import java.util.Map;
 
 /**
  * OSM element parsers generated from the <a href="https://github.com/omniscale/imposm3">imposm3</a> table definitions
- * in the <a href="https://github.com/openmaptiles/openmaptiles/blob/v3.15/openmaptiles.yaml">OpenMapTiles vector tile
+ * in the <a href="https://github.com/openmaptiles/openmaptiles/blob/master/openmaptiles.yaml">OpenMapTiles vector tile
  * schema</a>.
  *
  * These filter and parse the raw OSM key/value attribute pairs on tags into records with fields that match the columns
@@ -153,8 +153,8 @@ public class Tables {
 
     /** Imposm3 "mapping" to filter OSM elements that should appear in this "table". */
     public static final Expression MAPPING = and(or(
-      matchAny("landuse", "allotments", "farm", "farmland", "orchard", "plant_nursery", "vineyard", "grass",
-        "grassland", "meadow", "forest", "village_green", "recreation_ground"),
+      matchAny("landuse", "allotments", "farm", "farmland", "orchard", "flowerbed", "plant_nursery", "vineyard",
+        "grass", "grassland", "meadow", "forest", "village_green", "recreation_ground"),
       matchAny("natural", "wood", "wetland", "fell", "grassland", "heath", "scrub", "shrubbery", "tundra", "glacier",
         "bare_rock", "scree", "beach", "sand", "dune"),
       matchAny("leisure", "park", "garden", "golf_course"), matchAny("wetland", "bog", "swamp", "wet_meadow", "marsh",