Modules tab: enable tabs when modules are running
ConfigTaskWidget: emit the onConnected signal when appropriate

For some reason this was defined but never emitted.
Modules tab: rename toggle to enable

Also when a UAVO NAKs then we explicitly disable that tab
although this should be redundant with the default to false
at init.
Merge pull request #817 from peabody124/module_tab_enable

Module tab enabling