debian: depend on libdbd-sqlite3

Make sure that we don't fail at startup with:

<0009> db.c:621 Failed to create database connection to sqlite3 db
'sms.db'; Is the sqlite3 database driver for libdbi installed on this
system?

Tested by building the Debian package and looking at its depends.

Related: OS#3771
Change-Id: I7c099212a6ad7d87978c3dce63ce7385d8076bd1
diff --git a/debian/control b/debian/control
index f6e8ace..f4cd95e 100644
--- a/debian/control
+++ b/debian/control
@@ -30,7 +30,7 @@
 Package: osmo-msc
 Architecture: any
 Multi-Arch: foreign
-Depends: ${misc:Depends}, ${shlibs:Depends}
+Depends: ${misc:Depends}, ${shlibs:Depends}, libdbd-sqlite3
 Description: OsmoMSC: Osmocom's Mobile Switching Center for 2G and 3G circuit-switched mobile networks
   The Mobile Switching Center (MSC) is the heart of 2G/3G
   circuit-switched services.  It terminates the A-interface links from the