Fix Clock Rescaling Bug (Introduced in #135)

There was a mistake in the code-style refactor where the signature in the instruction encoding of `MRS` was set to `0xD54` instead of `0xD53` which would cause a SIGILL (Illegal Instruction) for devices which had their HW timer frequency equivalent to the Switch (19.2MHz) as a modified `MRS` would be deployed there. This issue should not affect devices which perform clock rescaling as the `MRS` instruction there is encoded by the assembler.

app/src/main/cpp/skyline/nce/instructions.h

@@ -60,7 +60,7 @@ namespace skyline::nce {
          * @url https://developer.arm.com/docs/ddi0596/latest/base-instructions-alphabetic-order/mrs-move-system-register
          */
         struct Mrs {
-            constexpr Mrs(u32 srcReg, registers::X destReg) : srcReg(srcReg), destReg(destReg), sig(0xD54) {}
+            constexpr Mrs(u32 srcReg, registers::X destReg) : srcReg(srcReg), destReg(destReg), sig(0xD53) {}
 
             constexpr bool Verify() {
                 return (sig == 0xD53);