matchWebGLToCanvasSize was not set properly in hooks/use-unity-arguments.ts

[leomav]

We were having trouble setting the matchWebGLToCanvasSize to false in order to specify manually the resolution of the unity canvas. Although we were setting it to false, we were printing it in console via unityInstance and it was still true.

We found that in use-unity-arguments the matchWebGLToCanvasSize was always set to true no matter the unityProps coming in, and made an adjustment in order to first check if the unityProp is of type boolean. If not boolean ('undefined', 'string', etc..), true should go as default as intended.

Just did a PR we think it should solve the issue