Interpreter_SystemRegisters: Change PanicAlert to INFO_LOG in mtspr()

As peculiar as this may be, decrementer exceptions by means of setting
the decrementer's zeroth bit from 0 to 1 is valid behavior by software
(and is defined in Programming Environments for 32-bit Microprocessors
in section 2.3.14.1 -- Decrementer operation). Given it's valid behavior,
it doesn't necessarily make sense to use a panic alert and halt, as this
isn't a condition where everything should be considered in a critical
state.

Instead, change it to an info log, so we still make note of it, but
without potentially tearing down state or halting emulation.

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