fix(amuleweb): remove copy-pasted preferences code from log page - #74

amuleweb-main-log.php contained a verbatim copy of the preferences
page's option-apply PHP block and its init_data() JavaScript helper,
left over from copy-pasting the page skeleton. This caused three
problems on every Log page view:

- visiting amuleweb-main-log.php?Submit=Apply&... silently rewrote
  the daemon preferences with mostly-zero values, since the copied
  block called amule_set_options() with whatever (usually empty)
  query parameters were present;
- the body onLoad called init_data(), which threw a JavaScript
  TypeError because the Log page has no "mainform" form;
- an unnecessary amule_get_options() round-trip to the core on
  every page load.

Remove the whole script block (formCommandSubmit and initvals were
also unused prefs leftovers) and the init_data() call from onLoad.

Verified against a running webserver: the Log page renders as
before, and loading it with ?Submit=Apply no longer changes any
daemon preference.