This reverts commit 223ff9c8ad.

The custom n vowel in ph_english did not specify a lengthmod and
the call to the base n did not set that value.

There is no fr-CA language dialect dialect file, nor has there
been in the espeak/espeak-ng history.

The fr-CA phoneme table defined the additional phonemes [U], [y"],
[E:], and [A]. The fr-FR phoneme table mapped these to [u], [y],
[E], and [a] respectively. This meant to describe the phonemes that
have not been merged in fr-CA, but have merged in fr-FR, as described
in https://en.wikipedia.org/wiki/Quebec_French_phonology.

The only use of these phonemes in the French dictionary was with
the word "tramway" using [E:]. This has been replaced with [E] to
match the rest of the dictionary file transcriptions, and those
phonemes for fr-CA have been removed.

If fr-CA is supported in the future, the French dictionary would
need to be modified to reverse the merger of the phonemes that are
not merged in fr-CA, with the merge logic being performed in the
fr-FR phoneme table like in the code being removed in this commit.