fix: don't pass quotes to espeak

Previously, the text was wrapped in an additional set of quotes that was passed
to Espeak. This could result in different phonemization in certain edges and
caused the insertion of an initial separator "_" that had to be removed.
Compare:
$ espeak-ng -q -b 1 -v en-us --ipa=1 '"A"'
_ˈɐ
$ espeak-ng -q -b 1 -v en-us --ipa=1 'A'
ˈeɪ

Fixes coqui-ai#2619

TTS/tts/utils/text/phonemizers/espeak_wrapper.py

@@ -185,20 +185,16 @@ def phonemize_espeak(self, text: str, separator: str = "|", tie=False) -> str:
         if tie:
             args.append("--tie=%s" % tie)
 
-        args.append('"' + text + '"')
+        args.append(text)
         # compute phonemes
         phonemes = ""
         for line in _espeak_exe(self._ESPEAK_LIB, args, sync=True):
             logging.debug("line: %s", repr(line))
             ph_decoded = line.decode("utf8").strip()
-            # espeak need to skip first two characters of the retuned text:
-            #   version 1.48.03: "_ p_ɹ_ˈaɪ_ɚ t_ə n_oʊ_v_ˈɛ_m_b_ɚ t_w_ˈɛ_n_t_i t_ˈuː\n"
+            # espeak:
             #   version 1.48.15: " p_ɹ_ˈaɪ_ɚ t_ə n_oʊ_v_ˈɛ_m_b_ɚ t_w_ˈɛ_n_t_i t_ˈuː\n"
-            # espeak-ng need to skip the first character of the retuned text:
-            #   "_p_ɹ_ˈaɪ_ɚ t_ə n_oʊ_v_ˈɛ_m_b_ɚ t_w_ˈɛ_n_t_i t_ˈuː\n"
-
-            # dealing with the conditions descrived above
-            ph_decoded = ph_decoded[:1].replace("_", "") + ph_decoded[1:]
+            # espeak-ng:
+            #   "p_ɹ_ˈaɪ_ɚ t_ə n_oʊ_v_ˈɛ_m_b_ɚ t_w_ˈɛ_n_t_i t_ˈuː\n"
 
             # espeak-ng backend can add language flags that need to be removed:
             #   "sɛʁtˈɛ̃ mˈo kɔm (en)fˈʊtbɔːl(fr) ʒenˈɛʁ de- flˈaɡ də- lˈɑ̃ɡ."