[FIX] sap.m.Button css styles for HCB theme - optimization

[INTERNAL]
- white spaces cleared

Change-Id: Icc34a76d78c0f7e7f583f3ae945be55418058f8e
Signed-off-by: Lidiya Bobeva <lidiya.bobeva@sap.com>
Merge "[FIX] sap.m.Button css styles for HCB theme - optimization"