Clear setInManifest flag if data collection value is set by API (#1945)

Author: mrwillis21

firebase-crashlytics/src/main/java/com/google/firebase/crashlytics/internal/common/DataCollectionArbiter.java

@@ -80,6 +80,10 @@ public synchronized boolean isAutomaticDataCollectionEnabled() {
   }
 
   public synchronized void setCrashlyticsDataCollectionEnabled(@Nullable Boolean enabled) {
+    if (enabled != null) {
+      setInManifest = false;
+    }
+
     crashlyticsDataCollectionEnabled =
         (enabled != null)
             ? enabled