Fix the failing plot3d_projection test (#2415)

Author: seisman

pygmt/tests/baseline/test_plot3d_projection.png.dvc

@@ -1,4 +1,4 @@
 outs:
-- md5: 9db4a08f03a39f5ea3106df0c870b0b4
-  size: 37904
+- md5: 3e2050baf59fa2ec7dbe7e3340eea32f
+  size: 34774
   path: test_plot3d_projection.png

pygmt/tests/test_plot3d.py

@@ -104,7 +104,7 @@ def test_plot3d_projection(data, region):
         zscale=5,
         perspective=[225, 30],
         region=region,
-        projection="R270/10c",
+        projection="R40/10c",
         style="s1c",
         fill="green",
         frame=["ag", "zag"],