Fix UseDeclaredVarsMoreThanAssignment not recognizing script variables

Author: quoctruong

Rules/UseDeclaredVarsMoreThanAssignments.cs

@@ -54,7 +54,8 @@ public IEnumerable<DiagnosticRecord> AnalyzeScript(Ast ast, string fileName)
                     foreach (VariableExpressionAst assignmentVarAst in assingmentVarAsts)
                     {
                          //Ignore if variable is global or environment variable
-                        if (!Helper.Instance.IsVariableGlobalOrEnvironment(assignmentVarAst, ast))
+                        if (!Helper.Instance.IsVariableGlobalOrEnvironment(assignmentVarAst, ast)
+                            && !assignmentVarAst.VariablePath.IsScript)
                         {
                             if (!assignments.ContainsKey(assignmentVarAst.VariablePath.UserPath))
                             {

Tests/Rules/UseDeclaredVarsMoreThanAssignmentsNoViolations.ps1

@@ -1,2 +1,3 @@
 $declaredVars = "Declared Vars"
-Write-Ouput $declaredVars
+Write-Ouput $declaredVars
+$script:thisshouldnotraiseerrors = "this should not raise errors"