[empathy] Use dash instead of underscore in some of the action names

[Tomas Popela <tpopela src gnome org>]

commit 394daa33c6ac23750ed08b0765d5e7f01f35a651
Author: Tomas Popela <tpopela redhat com>
Date:   Tue Jul 25 15:03:39 2017 +0200

    Use dash instead of underscore in some of the action names
    
    Underscore is not a valid character for action name. Fixes critical
    warning during startup.

 src/empathy-roster-window.c |    4 ++--
 src/empathy.c               |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/empathy-roster-window.c b/src/empathy-roster-window.c
index 6249d27..101698f 100644
--- a/src/empathy-roster-window.c
+++ b/src/empathy-roster-window.c
@@ -1927,8 +1927,8 @@ static GActionEntry menubar_entries[] = {
 
 static GActionEntry app_entries[] =
 {
-  { "tab_next", next_tab_cb, NULL, NULL, NULL },
-  { "tab_prev", prev_tab_cb, NULL, NULL, NULL }
+  { "tab-next", next_tab_cb },
+  { "tab-prev", prev_tab_cb }
 };
 
 
diff --git a/src/empathy.c b/src/empathy.c
index 9978bd5..3b77a94 100644
--- a/src/empathy.c
+++ b/src/empathy.c
@@ -298,9 +298,9 @@ empathy_app_activate (GApplication *app)
           "win." EMPATHY_PREFS_UI_SHOW_OFFLINE,
           NULL);
       gtk_application_add_accelerator (GTK_APPLICATION (app),
-          "<Control>Page_Up", "win.tab_prev", NULL);
+          "<Control>Page_Up", "win.tab-prev", NULL);
       gtk_application_add_accelerator (GTK_APPLICATION (app),
-          "<Control>Page_Down", "win.tab_next", NULL);
+          "<Control>Page_Down", "win.tab-next", NULL);
 
       /* Allow Empathy to watch session state */
       autoaway = g_settings_get_boolean (self->gsettings,