FCL-JS: many non-const string params
Continuation of #40047. In SUBJ package using the same RegEx, I found many non-const str params. Full log:
```
+Search "[\(;]\s*\w+\s*:\s*string". Report with [styles].
<jstree.pp>: #3
< 36>: procedure SetS(AIndex : Integer; AValue: String);
<2568>: procedure TStrings.SetS(AIndex : Integer; AValue: String);
<3448>: Function CN(aName : String; DoClear : Boolean = True) : TJSElementNodes;
<jssrcmap.pas>: #5
< 147>: procedure SaveToFile(Filename: string); virtual;
< 148>: procedure LoadFromFile(Filename: string); virtual;
< 608>: procedure RaiseInvalid(Msg: string);
<1137>: procedure TSourceMap.SaveToFile(Filename: string);
<1151>: procedure TSourceMap.LoadFromFile(Filename: string);
<tstopas.pp>: #11
< 182>: procedure AllocatePasNames(FD: TJSFuncDef; aPrefix: String='');
< 183>: procedure AllocatePasNames(aList: TJSSourceElements; ParentName: String=''); virtual;
< 184>: procedure AllocatePasNames(aList: TJSElementNodes; ParentName: String=''); virtual;
< 185>: Function AllocatePasName(D: TJSElement; ParentName: String='') : TPasData;virtual;
< 218>: function WriteForwardClass(aName: string): Boolean;
<1388>: function TTypescriptToPas.AllocatePasName(D: TJSElement; ParentName: String): TPasData;
<1639>: procedure TTypescriptToPas.AllocatePasNames(FD : TJSFuncDef; aPrefix: String = '');
<1647>: procedure TTypescriptToPas.AllocatePasNames(aList : TJSElementNodes; ParentName: String = '');
<1704>: procedure TTypescriptToPas.AllocatePasNames(aList : TJSSourceElements; ParentName: String = '');
<3040>: function TTypescriptToPas.WriteForwardClass(aName : string) : Boolean;
<3359>: Function GetInterfaces(aName : String) : TJSInterfaceDeclarationArray;
```
issue