fix bad filter typing (#1388)

Author: CommanderStorm

src/reference/v8.json

@@ -654,7 +654,7 @@
       "doc": "Size of the tile buffer on each side. A value of 0 produces no buffer. A value of 512 produces a buffer as wide as the tile itself. Larger values produce fewer rendering artifacts near tile edges and slower performance."
     },
     "filter": {
-      "type": "*",
+      "type": "filter",
       "doc": "An expression for filtering features prior to processing them for rendering."
     },
     "tolerance": {
@@ -2777,9 +2777,16 @@
     }
   },
   "filter": {
-    "type": "array",
-    "value": "*",
-    "doc": "A filter selects specific features from a layer."
+    "type": "boolean",
+    "doc": "A filter selects specific features from a layer.",
+    "expression": {
+      "interpolated": false,
+      "parameters": [
+        "zoom",
+        "feature"
+      ]
+    },
+    "property-type": "data-driven"
   },
   "filter_operator": {
     "type": "enum",