get-rommanager: Tell curl to follow url redirections.

Add -L flag to curl command to follow "Location: url" redirections,
as it won't follow HTTP 301/302 redirections by default.

Change-Id: I4272e1ac068094d9f9da50085de5e2a2cdf9058a
diff --git a/get-rommanager b/get-rommanager
index a1258b2..1997e93 100755
--- a/get-rommanager
+++ b/get-rommanager
@@ -1,2 +1,2 @@
 mkdir -p `dirname $0`/proprietary
-curl -o `dirname $0`/proprietary/RomManager.apk -O http://mirror.kanged.net/recoveries/RomManager.apk
+curl -o `dirname $0`/proprietary/RomManager.apk -O -L http://mirror.kanged.net/recoveries/RomManager.apk