fix: TypeError: a bytes-like object is required

I'm getting TypeError: a bytes-like object is required, not 'str' for that part of the code. `if capability.encode('utf-8') in result:`
or `if capability in result.decode('utf-8'):` could be better choices.

gtfonow/gtfonow.py

@@ -3669,7 +3669,7 @@ def check_capability(binary_path, capability):
     try:
         result, error = execute_command(["getcap", binary_path])
 
-        if capability in result:
+        if capability in result.decode('utf-8'):
             return True
         return False