meta-phosphor: fix S with trailing slash

Upstream OE added a warning when S has a trailing slash.  Remove the
trailing S from the flagged recipes to avoid the warning.

Change-Id: I457e7ee021b40b206bd3cd25d4cafe49854682a4
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/recipes-phosphor/sensors/dbus-sensors_git.bb b/recipes-phosphor/sensors/dbus-sensors_git.bb
index d20a99d..69d1e58 100644
--- a/recipes-phosphor/sensors/dbus-sensors_git.bb
+++ b/recipes-phosphor/sensors/dbus-sensors_git.bb
@@ -22,6 +22,6 @@
 DEPENDS = "boost nlohmann-json sdbusplus i2c-tools libgpiod"
 inherit cmake systemd
 
-S = "${WORKDIR}/git/"
+S = "${WORKDIR}/git"
 
 EXTRA_OECMAKE = "-DYOCTO=1"