Decrease run time up to 70%

[lu0]

Applying a default blur effect is painfully slow, here's the timing of 100 runs, just before rofi is triggered:

I decreased the runtime up to 70% (65% average) by scaling down the image and then scaling it up to fill the screen, thus simulating a blur effect.

The outcome is very similar to a common blur effect; I would say it is indistinguishable for the purposes of this project.

With a "normal" blur (before this change):

With simulated blur (after this change):