fix: filetype, coloring for executables and folder

When the reuse filetype code was introduced, an if statements logic was
accidentally flipped, marking exectuables as folders, and folders as
executables.

This incorporates the proposed patch by jschpp in #1195.

Refs: #883
Closes: #1195 #1196
Co-authored-by: =?UTF-8?q?Johannes=20Sch=C3=B6pp?= <darkdiscover@gmail.com>
Signed-off-by: Christina Sørensen <christina@cafkafk.com>

src/fs/file.rs

@@ -334,7 +334,7 @@ impl<'dir> File<'dir> {
  #[cfg(unix)]
  pub fn is_executable_file(&self) -> bool {
  let bit = modes::USER_EXECUTE;
- if self.is_file() {
+ if !self.is_file() {
  return false;
  }
  let Ok(md) = self.metadata() else {