Improve tests/scripts/depends.py code

As suggested by gilles-peskine-arm.

Co-authored-by: Gilles Peskine <gilles.peskine@arm.com>
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>

tests/scripts/depends.py

@@ -151,13 +151,12 @@ def set_config_option_value(conf, option, colors, value: Union[bool, str]):
     if value is False:
         log_command(['config.py', 'unset', option])
         conf.unset(option)
+    elif value is True:
+        log_command(['config.py', 'set', option])
+        conf.set(option)
     else:
-        if value is True:
-            log_command(['config.py', 'set', option])
-            conf.set(option)
-        else:
-            log_command(['config.py', 'set', option, value])
-            conf.set(option, value)
+        log_command(['config.py', 'set', option, value])
+        conf.set(option, value)
     return True
 
 def set_reference_config(conf, options, colors):