Update jquery.flot.navigate.js

BUGFIX navigation wheel scrolls page.
Remove some incorrect else-if logic in time plugin

Looks like this was mistakenly introduced in a whitespace/bracket cleanup.
Merge pull request #1020 from vird/patch-1

Avoid propagating mouse wheel events when they're first caught by the navigate plugin.
Merge pull request #1023 from danxshap/time_fix

Remove some incorrect else-if logic in time plugin.
Re-introduced the %h specifier for back-compat.
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