Startup: fixed error with matlab 2014b

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

initialise_gt.m

@@ -180,7 +180,7 @@ function initialise_gt(ignore_id19)
     end
 
     [~, hostname] = system('hostname');
-    if (verLessThan('matlab','8.6.0') ...
+    if (verLessThan('matlab', '8.4.0') ...
             && any(~cellfun(@isempty, regexpi(hostname, {'rnice', 'crunch', 'gpu'}))))
         % This fixes a few problems with rendering on the ESRF cluster
         opengl('software');