Fix HunyuanVideo 1.5 modular glyph regex to match curly quotes

The `extract_glyph_texts` helper in the HunyuanVideo 1.5 modular pipeline
had a copy-paste typo: both alternatives of the pattern matched ASCII
double quotes (`\"(.*?)\"|\"(.*?)\"`), making the second branch redundant
and silently dropping any text wrapped in the Chinese/smart curly quotes
`“…”`.

The non-modular counterpart in
`src/diffusers/pipelines/hunyuan_video1_5/pipeline_hunyuan_video1_5.py`
uses the correct pattern `\"(.*?)\"|“(.*?)”`, which is what the model
expects for glyph rendering — HunyuanVideo 1.5 is a bilingual model, so
Chinese prompts that quote text with `“…”` would skip glyph extraction
entirely under the modular path and produce mis-rendered poster text.

This aligns the modular pipeline's pattern with the canonical one.

Author: Ricardo-M-L

src/diffusers/modular_pipelines/hunyuan_video1_5/encoders.py

@@ -44,7 +44,7 @@ def format_text_input(prompt, system_message):
 
 
 def extract_glyph_texts(prompt):
-    pattern = r"\"(.*?)\"|\"(.*?)\""
+    pattern = r"\"(.*?)\"|“(.*?)”"
     matches = re.findall(pattern, prompt)
     result = [match[0] or match[1] for match in matches]
     result = list(dict.fromkeys(result)) if len(result) > 1 else result