Update to IntroCutscene audio quality for GameGallery

[thehansong]

#536 Update to IntroCutscene audio quality for GameGallery

Prerequires:

• Kar Lonng has assisted me in updating the Intro Cutscene Background Music. Download it here.
• Reviewer Must add the newly downloaded audio to Purring_Engine's 'Assets/Audio' folder.

Syonopsis of this PR:

• As seen in the attached images, Gavin mentioned that our Intro Cutscene Background Music was "lower" quality than expected. Thus, after discussion with Kar Lonng and AiXian, the decision was to "upped the volume of the initial violin part".
  
  
  

Checklist:

• Compare the submission M6 IntroCutscene audio to this new PR for GameGallery intro cutscene audio, paying close attention to any improvements made in sound design or audio quality.
• Ensure the IntroCutscene works in the actual engine in Debug, Release, and GameRelease modes.

Any clarifications, pm me.
Hans