everything: terminate bc instead of quit

On some systemd SIGQUIT causes the logger to save a coredump.
Quiting bc here does not need save a backtrace here, the termination is
not a crash its a "closing" of the program.

src/modules/everything/evry_plug_calc.c

@@ -94,7 +94,7 @@ _finish(Evry_Plugin *plugin)
 
    if (exe)
      {
-        ecore_exe_quit(exe);
+        ecore_exe_terminate(exe);
         ecore_exe_free(exe);
         exe = NULL;
      }