Fix pytrace=False and --tb=line reports None (#10905)

Closes #10831.

This fixes a small bug where running tests that contained
`pytest.fail(pytrace=False)` with the `--tb=line` flag set results in
 an output of "None" in the Failures section of the output, and adds
 a test to ensure the behavior is correct.

src/_pytest/_code/code.py

@@ -647,7 +647,7 @@ class ExceptionInfo(Generic[E]):
             Ignored if ``style=="native"``.
 
         :param str style:
-            long|short|no|native|value traceback style.
+            long|short|line|no|native|value traceback style.
 
         :param bool abspath:
             If paths should be changed to absolute or left unchanged.
@@ -977,9 +977,7 @@ class FormattedExcinfo:
                     )
                 else:
                     reprtraceback = self.repr_traceback(excinfo_)
-                reprcrash: Optional[ReprFileLocation] = (
-                    excinfo_._getreprcrash() if self.style != "value" else None
-                )
+                reprcrash = excinfo_._getreprcrash()
             else:
                 # Fallback to native repr if the exception doesn't have a traceback:
                 # ExceptionInfo objects require a full traceback to work.