Fix ruff alert (currently) not caught by pre-commit

SIM108 [*] Use ternary operator `... = ... if ... else ...` instead of `if`-`else`-block

codespell_lib/_codespell.py

@@ -292,10 +292,7 @@ def _split_lines(self, text: str, width: int) -> List[str]:
         for part in parts:
             # Eventually we could allow others...
             indent_start = "- "
-            if part.startswith(indent_start):
-                offset = len(indent_start)
-            else:
-                offset = 0
+            offset = len(indent_start) if part.startswith(indent_start) else 0
             part = part[offset:]
             part = self._whitespace_matcher.sub(" ", part).strip()
             parts = textwrap.wrap(part, width - offset)
@@ -1123,10 +1120,7 @@ def main(*args: str) -> int:
     if not options.colors or sys.platform == "win32":
         colors.disable()
 
-    if options.summary:
-        summary = Summary()
-    else:
-        summary = None
+    summary = Summary() if options.summary else None
 
     context = None
     if options.context is not None: