Allow disable_vabc flag in full OTA

Previously, brillo_update_payload only honors --disable_vabc flag for
incremental OTA. Respect this flag for full OTA as well.

Test: Generate a full OTA with --disable_vabc
Change-Id: Ic18dfdffd3e43ab139d1ea0704679ea38dd082c2
diff --git a/scripts/brillo_update_payload b/scripts/brillo_update_payload
index c510148..d1a1781 100755
--- a/scripts/brillo_update_payload
+++ b/scripts/brillo_update_payload
@@ -706,10 +706,11 @@
       GENERATOR_ARGS+=(
         --disable_verity_computation="${FLAGS_disable_verity_computation}" )
     fi
-    if [[ -n "${FLAGS_disable_vabc}" ]]; then
-      GENERATOR_ARGS+=(
-        --disable_vabc="${FLAGS_disable_vabc}" )
-    fi
+  fi
+
+  if [[ -n "${FLAGS_disable_vabc}" ]]; then
+    GENERATOR_ARGS+=(
+      --disable_vabc="${FLAGS_disable_vabc}" )
   fi
 
   # minor version is set only for delta or partial payload.