cleanup: move output_options into decrypt arms instead of cloning

The two decrypt match arms (range decrypt and full decrypt) are
mutually exclusive, so each can take ownership of output_options;
the clone() calls falsely suggested the value is used again later.
The encrypt path already moved it.

No behavior change beyond dropping one Option<PathBuf> clone per
decrypt invocation.

src/main.rs

@@ -259,7 +259,7 @@ fn run(mut cli: Cli) -> Result<(), FcryError> {
                     offset: o,
                     length: l,
                     max_argon_memory_mib: argon_cap.effective_mib,
-                    output: output_options.clone(),
+                    output: output_options,
                 };
                 decrypt_range(&options, raw_key.as_ref(), pw.as_ref())?;
             }
@@ -269,7 +269,7 @@ fn run(mut cli: Cli) -> Result<(), FcryError> {
                     output_file: output.as_deref().map(PathBuf::from),
                     threads,
                     max_argon_memory_mib: argon_cap.effective_mib,
-                    output: output_options.clone(),
+                    output: output_options,
                 };
                 decrypt(&options, raw_key.as_ref(), pw.as_ref())?;
             }