car-calendar: Update target SDK version to "current".

This will make GtsPermissionTestCases happy by using the
SDK for the target SDK.

Bug: 262284662
Test: atest com.google.android.permission.gts.PreloadAppsTargetSdkVersionTest#testPreloadedAppsTargetSdkVersion
Change-Id: I842eb22562aeae729b2717909650ac71b24ce5d0
diff --git a/Android.bp b/Android.bp
index ccddad5..09d04ba 100644
--- a/Android.bp
+++ b/Android.bp
@@ -22,7 +22,7 @@
     srcs: ["src/**/*.java"],
     resource_dirs: ["res"],
     sdk_version: "current",
-    target_sdk_version: "29",
+    target_sdk_version: "current",
     min_sdk_version: "28",
     optimize: {
         enabled: false,
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 56ce764..f3504fb 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -29,6 +29,7 @@
         android:supportsRtl="true">
 
         <activity android:name=".CarCalendarActivity"
+            android:exported="true"
             android:launchMode="singleTask">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>