Simplify `count` logic in `resource` blocks

[evairmarinho]

Actual state example:

resource "aws_resource" "my_resource" {
count = (var.transit_gateway_deployment == true && var.transit_gateway_peering_enabled == true ? 1 : 0)
}

Proposal:

resource "aws_resource" "my_resource" {
count = var.transit_gateway_deployment && var.transit_gateway_peering_enabled ? 1 : 0
}