fix formatting in fakeudev module

Signed-off-by: Zen <[email protected]>

Author: desultory

src/ugrd/fs/fakeudev.py

@@ -16,5 +16,5 @@ def fake_dm_udev(self):
             '    source "${dm}/uevent"',
             '    einfo "Faking udev for ${DEVNAME}"',
             '    udev_db_file="/run/udev/data/b${MAJOR}:${MINOR}"',
-            "    echo -e 'E:DM_UDEV_PRIMARY_SOURCE_FLAG=1\n' > ${udev_db_file}",
+            """    echo -e 'E:DM_UDEV_PRIMARY_SOURCE_FLAG=1\n' > ${udev_db_file}""",
             'done']