chore: set default value to wm on define

Cargo.lock

@@ -64,7 +64,7 @@ checksum = "7ff69b9dd49fd426c69a0db9fc04dd934cdb6645ff000864d98f7e2af8830eaa"
 
 [[package]]
 name = "bunbun"
-version = "1.0.0"
+version = "1.1.0"
 dependencies = [
  "clap",
  "colored",

src/main.rs

@@ -41,14 +41,12 @@ fn main() {
 
     let kernel = System::kernel_version().unwrap_or(String::from("N/A"));
     let pretty = distro();
-    let wm: &str;
+    let mut wm: &str = "N/A";
 
     if cfg!(windows) {
         wm = "Aero";
     } else if cfg!(unix) {
         wm = env!("XDG_CURRENT_DESKTOP");
-    } else {
-        wm = "N/A";
     }
 
     println!();