theme: print to log not to console

Seems this can cause trouble in case we cant use the theme properly.

src/config/theme.c

@@ -52,7 +52,6 @@
 #include "config/theme.h"
 #include "config/preferences.h"
 #include "config/color.h"
-#include "ui/ui.h"
 
 static GString *theme_loc;
 static GKeyFile *theme;
@@ -810,7 +809,7 @@ theme_attrs(theme_item_t attrs)
     // lookup colour pair
     result = color_pair_cache_get(lookup_str->str);
     if (result < 0) {
-        cons_show("Unable to load colour theme");
+        log_error("Unable to load colour theme");
         result = 0;
     }
     g_string_free(lookup_str, TRUE);