unpause backup as soon as possible when waiting for version

fdbserver/workloads/IncrementalBackup.actor.cpp

@@ -75,6 +75,7 @@ struct IncrementalBackupWorkload : TestWorkload {
 
 	ACTOR static Future<bool> _check(Database cx, IncrementalBackupWorkload* self) {
 		if (self->waitForBackup) {
+			wait(self->backupAgent.changePause(cx, false));
 			state Reference<IBackupContainer> backupContainer;
 			state UID backupUID;
 			state Version v;

tests/restarting/from_7.0.0/SnapIncrementalRestore-1.toml

@@ -10,6 +10,7 @@ runConsistencyCheck = false
     testName = 'IncrementalBackup'
     tag = 'default'
     submitOnly = true
+    waitForBackup = true
 
 [[test]]
 testTitle = 'PreSnapWorkloads'