js: Better handling of games without presets and/or solve

Games with neither presets nor configuration (which may only be the Null
Game) have been slightly broken since the introduction of hierarchical
preset menus, in that the code to remove the "Type..." menu stopped
being called then.  My switch to using radio buttons in menus then broke
them utterly because it's not possible to set the value of an empty
radio group, causing a crash at startup.

Fix this by detected when there's no preset menu, removing the item from
the menu bar, and setting the variable that's meant to indicate this has
been done.

The solve button problem was more subtle, in that only the <button> was
being hidden and not the <li> containing it, which led to the right border of the menu bar being two pixels thick.  Switch to fully removing
the <li> from the DOM, like we now do with the presets menu, since that
also makes my keyboard handler (in another branch) simpler.

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