Gtk: do not attempt automatic ANSI key translation for dead keys

* At least on Windows it was observed that teco_interface_get_ansi_key()
  would find ANSI keys on other layouts, but nothing corresponding to the key itself.
  For instance, for a dead caret (^), we'd find backslash.
  This made it impossible to type caret in the parser start states.
* We clumsily detect whether a keyevent refers to a dead key by checking its
  symbolic name and pass it down to the input method unmodified.
* Fixes entering dead keys, at the very least on Windows, but potentially
  on all other systems as well.

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