fix: revert max flag check to non-zero

Author: jmmaranan

Diff for: src/window.ts

@@ -238,7 +238,7 @@ export class ShellWindow {
     }
 
     is_maximized(): boolean {
-        let maximized = this.meta.get_maximized() == Meta.MaximizeFlags.BOTH;
+        let maximized = this.meta.get_maximized() !== 0;
         return maximized;
     }