[LyX/master] Initialize correctly the default keymap

[Jean-Marc Lasgouttes]

commit 0d38729281ab6d19a99cd874cce7b7132f3c9fb7
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Tue Jul 21 11:36:49 2015 +0200

    Initialize correctly the default keymap
    
    If keymaps are activated and there is a secondary keymap but no
    primary one, then the pointer to the active keymap was 0x0. This can't
    be good.
    
    Fixes bug #9685.

diff --git a/src/Trans.cpp b/src/Trans.cpp
index 1f2b3a8..d4d4110 100644
--- a/src/Trans.cpp
+++ b/src/Trans.cpp
@@ -580,7 +580,7 @@ Trans TransManager::default_;
 
 
 TransManager::TransManager()
-       : active_(0)
+       : active_(&default_)
 {}