Fix WasiFetch1.lpr to compile

1. adjust to new dotted unit names (Job.Shared, Job.JS)

2. and do not export JOBCallback (not necessary anymore, see analogous commit to other examples in https://gitlab.com/freepascal.org/fpc/pas2js/-/commit/80f9f00aa30e7fcb9214631096c57c1031eeb622 and talk in https://gitlab.com/freepascal.org/fpc/pas2js/-/issues/39288 )

demo/wasienv/fetch/WasiFetch1.lpr

@@ -5,7 +5,7 @@ library WasiFetch1;
 {$codepage UTF8}
 
 uses
-  SysUtils, Classes, JOB_Shared, JOB_Web, JOB_JS, Variants;
+  SysUtils, Classes, JOB.Shared, JOB_Web, JOB.JS, Variants;
 
 type
 
@@ -164,15 +164,6 @@ begin
   writeln('TWasmApp.Run END');
 end;
 
-// workaround: fpc wasm does not yet support exporting functions from units
-function JOBCallback(const Func: TJOBCallback; Data, Code: Pointer; Args: PByte): PByte;
-begin
-  Result:=JOB_JS.JOBCallback(Func,Data,Code,Args);
-end;
-
-exports
-  JOBCallback;
-
 var
   Application: TWasmApp;
 begin