sload_f2fs: update code for correct binary name

Change-Id: I7c14ec0b76d82d2b0951fd57fbc7184acc09d25a
(cherry picked from commit 8833868a48b054c708650c136c9b27b48c901ce0)
diff --git a/Android.mk b/Android.mk
index d65930e..679c2ec 100755
--- a/Android.mk
+++ b/Android.mk
@@ -549,7 +549,7 @@
         mkfs.ntfs
 endif
 ifeq ($(TARGET_USERIMAGES_USE_F2FS), true)
-    TWRP_REQUIRED_MODULES += sload.f2fs \
+    TWRP_REQUIRED_MODULES += sload_f2fs \
         libfs_mgr \
         fs_mgr \
         libinit