Fix scanner bugs

1. Change wrong Precondition check in ScanListenerTransport
2. Move FastPairManger initiator to onBootPhase()
3. nit: Remove extra empty line

Test: Build and verified NearbyManger log
Change-Id: I6bb7d98ad49e3246054976e634e65ec428de36e5
diff --git a/nearby/framework/java/android/nearby/NearbyManager.java b/nearby/framework/java/android/nearby/NearbyManager.java
index 4b69e4f..20f9164 100644
--- a/nearby/framework/java/android/nearby/NearbyManager.java
+++ b/nearby/framework/java/android/nearby/NearbyManager.java
@@ -149,8 +149,8 @@
                 @CallbackExecutor Executor executor) {
             Preconditions.checkArgument(scanCallback != null,
                     "invalid null callback");
-            Preconditions.checkState(ScanRequest.isValidScanType(mScanType),
-                    "invalid scan type : " + mScanType
+            Preconditions.checkState(ScanRequest.isValidScanType(scanType),
+                    "invalid scan type : " + scanType
                             + ", scan type must be one of ScanRequest#SCAN_TYPE_");
             mScanType = scanType;
             mScanCallback = scanCallback;
diff --git a/nearby/service/java/com/android/server/nearby/NearbyService.java b/nearby/service/java/com/android/server/nearby/NearbyService.java
index 12eea8b..b851c72 100644
--- a/nearby/service/java/com/android/server/nearby/NearbyService.java
+++ b/nearby/service/java/com/android/server/nearby/NearbyService.java
@@ -52,7 +52,6 @@
             Log.d(TAG, "Publishing NearbyService");
         }
         publishBinderService(Context.NEARBY_SERVICE, mImpl);
-        mFastPairManager.initiate();
     }
 
     @Override
@@ -62,6 +61,7 @@
         } else if (phase == PHASE_BOOT_COMPLETED) {
             // the nearby service must be functioning after this boot phase.
             mImpl.onSystemReady();
+            mFastPairManager.initiate();
         }
     }
 
diff --git a/nearby/service/java/com/android/server/nearby/fastpair/FastPairManager.java b/nearby/service/java/com/android/server/nearby/fastpair/FastPairManager.java
index 0457f4f..d6625a4 100644
--- a/nearby/service/java/com/android/server/nearby/fastpair/FastPairManager.java
+++ b/nearby/service/java/com/android/server/nearby/fastpair/FastPairManager.java
@@ -16,7 +16,6 @@
 
 package com.android.server.nearby.fastpair;
 
-
 import static com.android.server.nearby.fastpair.Constant.DEVICE_PAIRING_FRAGMENT_TYPE;
 import static com.android.server.nearby.fastpair.Constant.EXTRA_BINDER;
 import static com.android.server.nearby.fastpair.Constant.EXTRA_BUNDLE;