Tiny login form usability fixes.

System version 0.296
modules:
Blogs 0.048
Comments 0.010
Cron 0.006
Feedback 0.002
HybridAuth 2.1.1-cs23
OAuth2 0.016
Plupload 1.5.7-cs5
Static_pages 0.028
plugins:
Admin_default_theme 0.004
TinyMCE 4.0.1-cs5