Revert "Rename md5 property in default sb3 project to md5ext to reflect it's actual contents."

scratch-audio depends on sound property being called md5 even though it refers to md5+file ext,
so this property cannot be renamed just yet.

This reverts commit dee7195f.

src/lib/default-project/project.json

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+{"targets":[{"id":"`jEk@4|i[#Fk?(8x)AV.","name":"Stage","isStage":true,"x":0,"y":0,"size":100,"direction":90,"draggable":false,"currentCostume":0,"costume":{"name":"backdrop1","bitmapResolution":1,"rotationCenterX":240,"rotationCenterY":180,"skinId":2,"dataFormat":"png","assetId":"739b5e2a2435f6e1ec2993791b423146"},"costumeCount":1,"visible":true,"rotationStyle":"all around","blocks":{},"variables":{"`jEk@4|i[#Fk?(8x)AV.-my variable":{"id":"`jEk@4|i[#Fk?(8x)AV.-my variable","name":"my variable","type":"","isCloud":false,"value":0}},"lists":{},"costumes":[{"name":"backdrop1","bitmapResolution":1,"rotationCenterX":240,"rotationCenterY":180,"skinId":2,"dataFormat":"png","assetId":"739b5e2a2435f6e1ec2993791b423146"}],"sounds":[{"name":"pop","format":"","rate":11025,"sampleCount":258,"soundID":1,"md5":"83a9787d4cb6f3b7632b4ddfebf74367.wav","data":null,"dataFormat":"wav","assetId":"83a9787d4cb6f3b7632b4ddfebf74367","soundId":"p=i?*Zt*I]@]x_*V`mut"}]},{"id":"9xJ@2eKXvx:/*Q^3Rib#","name":"Sprite1","isStage":false,"x":0,"y":0,"size":100,"direction":90,"draggable":false,"currentCostume":0,"costume":{"name":"costume1","bitmapResolution":1,"rotationCenterX":47,"rotationCenterY":55,"skinId":0,"dataFormat":"svg","assetId":"09dc888b0b7df19f70d81588ae73420e"},"costumeCount":2,"visible":true,"rotationStyle":"all around","blocks":{},"variables":{},"lists":{},"costumes":[{"name":"costume1","bitmapResolution":1,"rotationCenterX":47,"rotationCenterY":55,"skinId":0,"dataFormat":"svg","assetId":"09dc888b0b7df19f70d81588ae73420e"},{"name":"costume2","bitmapResolution":1,"rotationCenterX":47,"rotationCenterY":55,"skinId":1,"dataFormat":"svg","assetId":"3696356a03a8d938318876a593572843"}],"sounds":[{"name":"Meow","format":"","rate":22050,"sampleCount":18688,"soundID":0,"md5":"83c36d806dc92327b9e7049a565c6bff.wav","data":null,"dataFormat":"wav","assetId":"83c36d806dc92327b9e7049a565c6bff","soundId":"]z6@jLeJ2W%gr/eA1HB+"}]}],"meta":{"semver":"3.0.0","vm":"0.1.0","agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"}}
\ No newline at end of file