Add generated lo.xcent to .gitignore

(recently introduced in c78b49ec13 "don't specify
entitlements that are not used (sdremote w/o bluetooth)")

Change-Id: Ied7db52d891e92224bc2be0ad1277f40e5d80b3c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/136752
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

.gitignore

@@ -60,6 +60,7 @@
 /bin/odfvalidator.sh
 /bin/officeotron.sh
 /hardened_runtime.xcent
+/lo.xcent
 /vs-code.code-workspace.template
 /Makefile