core157: Fix ppp symlink

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

diff --git a/config/rootfiles/core/157/filelists/ppp b/config/rootfiles/core/157/filelists/ppp
new file mode 120000 (symlink)
index 0000000..4844a9b
--- /dev/null
+++ b/config/rootfiles/core/157/filelists/ppp
@@ -0,0 +1 @@
+../../../common/ppp
\ No newline at end of file

diff --git a/config/rootfiles/core/157/filelists/pppd b/config/rootfiles/core/157/filelists/pppd
deleted file mode 120000 (symlink)
index 0f47589..0000000
--- a/config/rootfiles/core/157/filelists/pppd
+++ /dev/null
@@ -1 +0,0 @@
-../../../common/pppd
\ No newline at end of file