dbus-top: use mvwaddstr when no arguments are needed

Currently, some of the code uses mvwprintw to print a string without
using a format string, this causes the following errors:

error: format not a string literal and no format arguments
[-Werror=format-security]

The fix is to use mvwaddstr when no arguments are needed.

Signed-off-by: Sui Chen <suichen@google.com>
Change-Id: Ib17ad7a7795cb7bf77161f8730139f38216b7aba
diff --git a/dbus-top/menu.cpp b/dbus-top/menu.cpp
index af59f14..47d1f57 100644
--- a/dbus-top/menu.cpp
+++ b/dbus-top/menu.cpp
@@ -75,7 +75,7 @@
             {
                 s.push_back(' ');
             }
-            mvwprintw(win_, y, x, s.c_str());
+            mvwaddstr(win_, y, x, s.c_str());
             wattrset(win_, 0);
         }
         else
@@ -319,4 +319,4 @@
         *ret = r;
     }
     return true;
-}
\ No newline at end of file
+}