[INTERNAL][FIX] sap.m.BusyDialog: Add padding to footer

Add .sapMBusyDialogFooter class to the toolbar which
is rendered only for desktop.

Change-Id: If97cf12d03807a38d6e3a970ed8c34ae87addd78
Signed-off-by: Deyan Yanakiev <deyan.yanakiev@sap.com>
CR-Id: 012003146900008986062014
(cherry picked from commit 28de530f66c5366360751897d2ac0c0d1d0a5391)
Merge "[INTERNAL][FIX] sap.m.BusyDialog: Add padding to footer" into rel-1.26