app-grid-folder-button: Force 16px as icon size

Arun Mani Jrequested to merge
arun-mani-j/phosh:icons-too-big into main

We now force icon-size of individual icons in the grid to be of 16px (16 because it is what GTK_ICON_SIZE_BUTTON equals to).

image

Closes: #1072 (closed)

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