releasetools: Merge two identical conditional branches.

The merged two branches have become identical since commit
fc3422ad3697b5d83adfb69133f66e1623416b18 (landed into Nougat).

Test: Get identical incremental packages w/ and w/o the CL.
Change-Id: Id1183f8ed83f684a0dac1a4af87b6e075b08aabc
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 5a24d5e..956f000 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -1449,14 +1449,7 @@
         return
 
       ranges_str = ranges.to_string_raw()
-      if self.version >= 4:
-        script.AppendExtra(('if (range_sha1("%s", "%s") == "%s" || '
-                            'block_image_verify("%s", '
-                            'package_extract_file("%s.transfer.list"), '
-                            '"%s.new.dat", "%s.patch.dat")) then') % (
-                            self.device, ranges_str, expected_sha1,
-                            self.device, partition, partition, partition))
-      elif self.version == 3:
+      if self.version >= 3:
         script.AppendExtra(('if (range_sha1("%s", "%s") == "%s" || '
                             'block_image_verify("%s", '
                             'package_extract_file("%s.transfer.list"), '