input: fix PowerShell fingerprint scripts

When the default language is set to PowerShell, any script without the
language suffix should apply to PowerShell. Specifically, the
"fingerprintScript" should be executed as PowerShell script if
"fingerprintScriptPwsh" is not set. This was not working, though.

pym/bob/input.py

@@ -3722,7 +3722,7 @@ def __createSchemas(self):
                         schema.Optional('environment') : VarDefineValidator("provideTools::environment"),
                         schema.Optional('fingerprintScript', default="") : str,
                         schema.Optional('fingerprintScriptBash') : str,
-                        schema.Optional('fingerprintScriptPwsh', default="") : str,
+                        schema.Optional('fingerprintScriptPwsh') : str,
                         schema.Optional('fingerprintIf') : schema.Or(None, str, bool, IfExpression),
                         schema.Optional('fingerprintVars') : [ varNameUseSchema ],
                     })
@@ -3742,7 +3742,7 @@ def __createSchemas(self):
             schema.Optional('packageNetAccess') : bool,
             schema.Optional('fingerprintScript', default="") : str,
             schema.Optional('fingerprintScriptBash') : str,
-            schema.Optional('fingerprintScriptPwsh', default="") : str,
+            schema.Optional('fingerprintScriptPwsh') : str,
             schema.Optional('fingerprintIf') : schema.Or(None, str, bool, IfExpression),
             schema.Optional('fingerprintVars') : [ varNameUseSchema ],
             schema.Optional('scriptLanguage') : schema.And(schema.Or("bash", "PowerShell"),