packaging: Remove trailing whitespace from extra_tarballs arg

This was overlooked during the reviews.

Fixes: #6415 -- part III

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

tools/packaging/kata-deploy/local-build/kata-deploy-binaries.sh

@@ -344,7 +344,7 @@ install_cached_kernel_tarball_component() {
 		"${latest_builder_image}" \
 		"${final_tarball_name}" \
 		"${final_tarball_path}" \
-		"${extra_tarballs} " \
+		"${extra_tarballs}" \
 		|| return 1
 	
 	if [[ "${kernel_name}" != "kernel-sev" ]] && [[ "${kernel_name}" != "kernel"*"-confidential" ]]; then