Updates termplex: 777ce69 Revert "Use DIRNAME to invoke wtmux an wscreen"

diff --git a/termplex b/termplex
index e158af4f951880a9f5ad516ea8ab69835e778b9f..777ce6973d8aa569db0fe4ebe36761747392d9c7 160000 (submodule)
--- a/termplex
+++ b/termplex
@@ -1 +1 @@
-Subproject commit e158af4f951880a9f5ad516ea8ab69835e778b9f
+Subproject commit 777ce6973d8aa569db0fe4ebe36761747392d9c7