hooks.py(fix[set_hook]): Remove invalid _format parameter

why: tmux set-hook does not accept -F flag (only set-option does).
     Verified against ~/study/c/tmux/cmd-set-option.c:65 which shows
     set-hook accepts "agpRt:uw" only.
what:
- Remove _format parameter from set_hook() signature
- Remove _format flag handling code

Author: tony

src/libtmux/hooks.py

@@ -111,7 +111,6 @@ def set_hook(
         self,
         hook: str,
         value: int | str,
-        _format: bool | None = None,
         unset: bool | None = None,
         run: bool | None = None,
         prevent_overwrite: bool | None = None,
@@ -158,10 +157,6 @@ def set_hook(
             assert isinstance(run, bool)
             flags.append("-R")
 
-        if _format is not None and _format:
-            assert isinstance(_format, bool)
-            flags.append("-F")
-
         if prevent_overwrite is not None and prevent_overwrite:
             assert isinstance(prevent_overwrite, bool)
             flags.append("-o")