Trim invalid response blob msg

Summary:
Small tweak to #43069 - trim the message to avoid ending with a newline.

Changelog:
[General][Changed] - Trim invalid blob response error message

Reviewed By: christophpurrer

Differential Revision: D54422284

fbshipit-source-id: 53a4e963f8aba36c55e16ad7539b2f2d98c781f8

packages/react-native/Libraries/Network/XMLHttpRequest.js

@@ -250,7 +250,7 @@ class XMLHttpRequest extends (EventTarget(...XHR_EVENTS): any) {
         } else {
           throw new Error(
             'Invalid response for blob - expecting object, was ' +
-              `${typeof this._response}: ${this._response}`,
+              `${typeof this._response}: ${this._response.trim()}`,
           );
         }
         break;