Update functions from umount2 to Unmount_by_Path

Change-Id: Ib701c1002ceccfef222424941aa55e13a290d996
diff --git a/twrpApex.cpp b/twrpApex.cpp
index 22da17a..557283b 100755
--- a/twrpApex.cpp
+++ b/twrpApex.cpp
@@ -190,5 +190,5 @@
 }
 
 bool twrpApex::Unmount() {
-	return (umount2(APEX_BASE, MNT_DETACH) == 0);
+	return (PartitionManager.UnMount_By_Path(APEX_BASE, false, MNT_DETACH) == 0);
 }