Fix S2275: InvalidCastExteption when analyzing single argument method

[nnpcYvIVl]

RSPEC-S2275

Console.WriteLine(ulong.MaxValue);

Throws the following error

Warning	AD0001	Analyzer 'SonarAnalyzer.Rules.CSharp.StringFormatValidator' threw an exception of type 'System.InvalidCastException' with message 'Unable to cast object of type 'System.UInt64' to type 'System.String'.'.	ConsoleApp3		1	Active	Analyzer 'SonarAnalyzer.Rules.CSharp.StringFormatValidator' threw the following exception:
'Exception occurred with following context:
Compilation: ConsoleApp3
SyntaxTree: C:\Download\ConsoleApp3\ConsoleApp3\Program.cs
SyntaxNode: Console.WriteLine(ulong.MaxValue ... [InvocationExpressionSyntax]@[239..272) (12,12)-(12,45)

System.InvalidCastException: Unable to cast object of type 'System.UInt64' to type 'System.String'.
   at SonarAnalyzer.Rules.CSharp.StringFormatValidator.CheckForFormatStringIssues(SyntaxNodeAnalysisContext analysisContext)
   at SonarAnalyzer.Helpers.DiagnosticAnalyzerContextHelper.<>c__DisplayClass0_0`1.<RegisterSyntaxNodeActionInNonGenerated>b__0(SyntaxNodeAnalysisContext c)
   at SonarAnalyzer.Helpers.SonarAnalysisContext.<>c__DisplayClass12_0`1.<RegisterSyntaxNodeAction>b__0(SyntaxNodeAnalysisContext c)
   at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.<>c__DisplayClass42_1`1.<ExecuteSyntaxNodeAction>b__1()
   at Microsoft.CodeAnalysis.Diagnostics.AnalyzerExecutor.ExecuteAndCatchIfThrows_NoLock(DiagnosticAnalyzer analyzer, Action analyze, Nullable`1 info)