Removing duplicate CollectImages()

images are being flashed twice, because of an additional collectImages.
This is resulting in a ~50% increase in flashing time

Test: fastboot flashall -w
Change-Id: I6c271e1e1456cd789f37ebd67cefd221cabc6e7a
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 7994065..fb0e18b 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -1780,7 +1780,6 @@
     }
 
     DetermineSlot();
-    CollectImages();
 
     CancelSnapshotIfNeeded();