Fix push deregister error.

[brandonpage]

In #2545 I made a change to delay push deregister until the device had network connection so that the operation would succeed (eventually) even if the user chose to logout while offline. At the time of testing this worked correctly in all cases but since a change has been made that causes an error on deregister (likely the recent bugfix #2607, which retained the tokens after logout). The error doesn't actually cause the unregister operation to fail and is invisible to the end user, but an internal team ran into issues with automated testing because of it.

[mobilesdk-bot]

	1 Warning
:warning:	No Lint Results.

Tests results for SalesforceHybrid

Generated by :no_entry_sign: Danger

[mobilesdk-bot]

	1 Error
:no_entry_sign:	Tests have failed, see below for more information.

Tests:

Name	Classname	Time
testCleanGhostsOneObjectType	com.salesforce.androidsdk.mobilesync.target.BriefcaseSyncDownTargetTest	1.368
testSyncDownFetchingOneObjectType	com.salesforce.androidsdk.mobilesync.target.BriefcaseSyncDownTargetTest	2.084
testSyncDownFetchingTwoObjectTypes	com.salesforce.androidsdk.mobilesync.target.BriefcaseSyncDownTargetTest	3.846
testIdsToSkip	com.salesforce.androidsdk.mobilesync.target.BriefcaseSyncDownTargetTest	2.131
testStartFetchWithMaxTimeStamp	com.salesforce.androidsdk.mobilesync.target.BriefcaseSyncDownTargetTest	3.826
testCleanGhostsTwoObjectTypes	com.salesforce.androidsdk.mobilesync.target.BriefcaseSyncDownTargetTest	1.979
testSyncDownFetchingOneObjectTypeWithMultipleRetrieveCalls	com.salesforce.androidsdk.mobilesync.target.BriefcaseSyncDownTargetTest	2.393
testStartFetchNoMaxTimeStamp	com.salesforce.androidsdk.mobilesync.target.BriefcaseSyncDownTargetTest	2.377
testSyncDownFetchingTwoObjectTypesWithMultipleRetrieveCalls	com.salesforce.androidsdk.mobilesync.target.BriefcaseSyncDownTargetTest	4.669

Tests results for MobileSync

Generated by :no_entry_sign: Danger