CommandLine: remove junk from string literal

src/CommandLine.cxx

@@ -104,7 +104,7 @@ static void version(void)
 	     "This is free software; see the source for copying conditions.  There is NO\n"
 	     "warranty; not even MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
 	     "\n"
-	     "db/Database plugins:");
+	     "Database plugins:");
 
 	for (auto i = database_plugins; *i != nullptr; ++i)
 		printf(" %s", (*i)->name);