webadmin: remove redundant head element in alarms panel html

Not necessary, should have been removed numerous versions ago.

Target: master
Request: 2.11
Request: 2.10
Request: 2.9
Request: 2.8
Request: 2.7
Acked-by: Paul
Require-book: no
Require-notes: no
Merge pull request #1062 from alrossi/fix/2.9/alarms-remove-panel-html-heads

webadmin: remove redundant head element in alarms panel html