test: changed envelope to encompass 4 different parts of the geo grid

The envelope was previously assigned wrong max x and y values, which
resulted in errors as the coveringGeohash function didn't return
the expected amount of geo hashes.

src/test/java/com/esri/core/geometry/TestGeohash.java

@@ -184,7 +184,7 @@ public void testCoveringGeohashThreeGeohashes() {
 
   @Test
   public void testCoveringGeohashFourGeohashes() {
-    Envelope2D env = new Envelope2D(-180, -90, -140, -40);
+    Envelope2D env = new Envelope2D(-180, -90, -130, -40);
     String [] coverage = Geohash.coveringGeohash(env);
     assertEquals("0", coverage[0]);
     assertEquals("2", coverage[1]);