[inspector] return meaningful error on Debug.setScriptSource for ES module

test/inspector/debugger/set-script-source-exception-expected.txt

 Check that setScriptSource completes correctly when an exception is thrown.
 
 Running test: testIncorrectScriptId
 {
     error : {
         code : -32000
-        message : Uncaught Script not found
+        message : No script with given id found
     }
     id : <messageId>
 }
 
 Running test: testSourceWithSyntaxError
 {
     id : <messageId>
     result : {
         exceptionDetails : {
             columnNumber : 2
             exceptionId : <exceptionId>
             lineNumber : 0
             text : Invalid or unexpected token
         }
     }
 }