Fix accidental write in pcap #257
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After doing some simulations with my new test target, I found the following situation right at the start:

An unsolicited write burst is done to location 0, which I believe is addressing the On Chip Memory (and probably not catastrophic). The problem is that aw_throttle and w_throttle are initialized to 0 (which is the value it takes when dma_start is signaled), however, I took this as an opportunity to simplify the code(instead of changing the initial value) and got rid of those 2 signals and also improved the code style.
This bug was not introduced in 3a1b545, because uninitialized signals are implicitly set to 0, this bug has been there forever but because the write was not catastrophic, we never noticed.