There is no initial focus in some forms.

Initial focus is lost in Mass Update forms, it would be better to have it on first form element checkbox.
Pages affected:
1. Hosts mass update
2. Items mass update
3. Triggers mass update

Other forms with lost initial focus:
1. Administration - General - GUI form.
2. Administration - General - Houserkeeping form.
3. Administration - General - Macros form.
4. Administration - General - Triggers severities form.
5. Administration - General - Trigger displaying options form.
6. Administration - General - Other form.
7. All Import forms (Hosts, Templates, Maps, Screens, Value mapping).
8. Administration - Authentication form.