Fix up our external sample PrenotCalculator so it uses ios_application instead of just objc_binary.

RELNOTES:

--
MOS_MIGRATED_REVID=112601304

examples/objc/BUILD

diff --git a/examples/objc/BUILD b/examples/objc/BUILD
index 3aeee39..e7e4bfb 100644
--- a/examples/objc/BUILD
+++ b/examples/objc/BUILD
@@ -12,20 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-objc_binary(
+ios_application(
     name = "PrenotCalculator",
-    srcs = [
-        "PrenotCalculator/main.m",
-    ],
+    binary = ":PrenotCalculator_binary",
     infoplist = "PrenotCalculator/PrenotCalculator-Info.plist",
     visibility = ["//visibility:public"],
-    deps = [
-        ":PrenotCalculatorClasses",
-    ],
 )
 
-objc_library(
-    name = "PrenotCalculatorClasses",
+objc_binary(
+    name = "PrenotCalculator_binary",
     srcs = [
         "PrenotCalculator/AppDelegate.m",
         "PrenotCalculator/CalculatedValues.m",
@@ -34,6 +29,7 @@
         "PrenotCalculator/Equation.m",
         "PrenotCalculator/Literal.m",
         "PrenotCalculator/ValuesViewController.m",
+        "PrenotCalculator/main.m",
     ],
     hdrs = glob(
         ["**/*.h"],