Removing redundant LayoutParam creation.

[tslamic]

Hi guys,

I believe creating new layout params in the updateBackground() is redundant.

I was also tempted to change

params.setMargins(0, 0, -mMarginDp, 0);
params.setMargins(0, 0, 0, -mMarginDp);

to

params.rightMargin = -mMarginDp;
params.bottomMargin = -mMarginDp;

but I'm not sure if setting other margins to 0 was done on purpose. If not, maybe this shouldn't be reset to 0, since the user might have set the margins?