manifest: add back ExactCalculator

Change-Id: Ida7178ad901ad541d806195d26ebcb70ddf3dbd0
diff --git a/omni-aosp.xml b/omni-aosp.xml
index b83f768..f3f8a74 100644
--- a/omni-aosp.xml
+++ b/omni-aosp.xml
@@ -67,6 +67,7 @@
   <project path="packages/apps/CellBroadcastReceiver" name="android_packages_apps_CellBroadcastReceiver" remote="omnirom" revision="android-10" />
   <project path="packages/apps/Dialer" name="android_packages_apps_Dialer" remote="omnirom" revision="android-10" />
   <project path="packages/apps/DocumentsUI" name="android_packages_apps_DocumentsUI" remote="omnirom" revision="android-10" />
+  <project path="packages/apps/ExactCalculator" name="platform/packages/apps/ExactCalculator" groups="pdk-fs" revision="refs/tags/android-9.0.0_r50" />
   <!--<project path="packages/apps/EmergencyInfo" name="android_packages_apps_EmergencyInfo" remote="omnirom" revision="android-9.0" /> -->
   <project path="packages/apps/Launcher3" name="android_packages_apps_Launcher3" remote="omnirom" revision="android-10" />
   <project path="packages/apps/Gallery2" name="android_packages_apps_Gallery2" remote="omnirom" revision="android-10" />