gui/Properties: Don't expand memory patterns too far
gui/Properties: Don't expand memory patterns too far

Currently, when you place a new ROM component, it defaults to having an
8-bit address, so the component has its Contents property set to `256-0'
since 19b5fa8ade. However, if you then set the component's address bits
to 4, PropertyMemoryValidator.parse() attempt to expand this `256-0'
pattern past the end of the backing array of size 16, raising an
ArrayIndexOutOfBoundsException. This makes it impossible to shrink the
address bits of a ROM component.

So stop expanding a memory pattern thing when the backing array is full.

ra4king/CircuitSim,ra4king/CircuitSim,ra4king/CircuitSim,ra4king/CircuitSimulator