Simplify and fix the 'flash' scripts

 - Instead of having multiple if/elif/fi blocks that all run nearly the
   same thing, use variables
 - Use consistent indent/formatting
 - Use the correct program name in the "Usage:" text
 - Fix a couple if blocks that were missing 'fi'
 - Fix a couple of invalid variable assignments ("$var = value" should be
   "var=value")

I haven't actually tested these, but then with the last 2 items, they
weren't working anyway.

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