terminal/src/buildroot: Use specific version of ufr-lib

Using just master can mean that we will not be able to build our
software later, when ufr-lib changes its interface. Use current
version, where build works.

diff --git a/terminal/src/buildroot b/terminal/src/buildroot
index 6229f87b73ddf30d70690c266f93eab50c25b936..8e0f20c995488a46f6c89cadd514644c880320bb 160000 (submodule)
--- a/terminal/src/buildroot
+++ b/terminal/src/buildroot
@@ -1 +1 @@
-Subproject commit 6229f87b73ddf30d70690c266f93eab50c25b936
+Subproject commit 8e0f20c995488a46f6c89cadd514644c880320bb