ecore_imf_context: fixing default id getter

Summary:
If none of ECORE_IMF_MODULE and WAYLAND_DISPLAY variables are setted
best of available moduls should be found. Removed odd return statement.

Reviewers: cedric, seoz, Hermet

Reviewed By: Hermet

Subscribers: cedric, reutskiy.v.v

Differential Revision: https://phab.enlightenment.org/D1344

@fix

src/lib/ecore_imf/ecore_imf_context.c

@@ -78,7 +78,6 @@ ecore_imf_context_default_id_by_canvas_type_get(const char *canvas_type)
              id = "wayland";
              if (ecore_imf_module_get(id)) return id;
           }
-        return NULL;
      }
 
    modules = ecore_imf_module_available_get();