Fix gsi-pubsign-release.sh rsync command

Add trailing / to rsync source directory, this prevents rsync from
creating an additional level of directory under the destination.

For example, if `tree src` outputs:
  src
  └── file

then:
$ rsync src dest   # creates dest/src/file
$ rsync src/ dest  # creates dest/file

Bug: 149803895
Test: ./gsi-pubsign-release.sh aosp_arm64 aosp_arm64_pubsign \
        aosp_arm64-artifact_path aosp_arm64_pubsign-artifact_path

Merged-In: I90a80a7afdf6f71db592599c6a645554cf830309
Change-Id: I90a80a7afdf6f71db592599c6a645554cf830309
(cherry picked from commit 8b15a8ba3c)

gsi/gsi-pubsign-release.sh

@@ -53,7 +53,7 @@ fi
 
 # Don't copy logs/ and files whose name starts with $SRC_PRODUCT
 rsync --verbose --archive --copy-links --exclude='logs' \
-  --exclude="${SRC_PRODUCT}-*" "${SRC_DIR}" "${DIST_DIR}"
+  --exclude="${SRC_PRODUCT}-*" "${SRC_DIR}/" "${DIST_DIR}"
 
 # Rename ${SRC_PRODUCT}-xxx.yyy to ${TARGET_PRODUCT}-xxx.yyy
 for src_path in $(find "${SRC_DIR}" -type f -name "${SRC_PRODUCT}-*") ; do