Use 15 random bytes as image id so we don't get base64 padding.
Use 15 random bytes as image id so we don't get base64 padding.

gerzhan/spreed-webrtc,strukturag/spreed-webrtc,shelsonjava/spreed-webrtc,gerzhan/spreed-webrtc,theurere/spreed-webrtc,gerzhan/spreed-webrtc,tymiles003/spreed-webrtc,gerzhan/spreed-webrtc,strukturag/spreed-webrtc,theurere/spreed-webrtc,shelsonjava/spreed-webrtc,tymiles003/spreed-webrtc,gerzhan/spreed-webrtc,strukturag/spreed-webrtc,fancycode/spreed-webrtc,strukturag/spreed-webrtc,theurere/spreed-webrtc,fancycode/spreed-webrtc,fancycode/spreed-webrtc,theurere/spreed-webrtc,shelsonjava/spreed-webrtc,fancycode/spreed-webrtc,strukturag/spreed-webrtc,gerzhan/spreed-webrtc,tymiles003/spreed-webrtc,fancycode/spreed-webrtc,tymiles003/spreed-webrtc,shelsonjava/spreed-webrtc,tymiles003/spreed-webrtc,theurere/spreed-webrtc,theurere/spreed-webrtc,shelsonjava/spreed-webrtc,shelsonjava/spreed-webrtc,strukturag/spreed-webrtc,shelsonjava/spreed-webrtc,gerzhan/spreed-webrtc,fancycode/spreed-webrtc