fix: use correct settings key to remove parts of the version in regex metadata plugin (#887)

Hello together.

I've been trying to use the `remove` settings key for the `regex`
metadata plugin and noticed, that it has been non-functional for me. To
me, it looks like the plugin acquires the wrong value from the settings
dictionary (`result` instead of `remove`). This PR intends to change
this to what I believe is correct.

---------

Co-authored-by: Henry Schreiner <[email protected]>

Author: philippjh

src/scikit_build_core/metadata/regex.py

@@ -46,7 +46,7 @@ def dynamic_metadata(
     )
     result = settings.get("result", "{value}")
     assert isinstance(result, str)
-    remove = settings.get("result", "")
+    remove = settings.get("remove", "")
 
     with Path(input_filename).open(encoding="utf-8") as f:
         match = re.search(regex, f.read(), re.MULTILINE)

tests/test_dynamic_metadata.py

@@ -346,4 +346,4 @@ def test_regex_remove(
         },
     )
 
-    assert version == "1.2.3dev1" if dev else "1.2.3"
+    assert version == ("1.2.3dev1" if dev else "1.2.3")