general: Make formatting of logged hex values more straightforward

This makes the formatting expectations more obvious (e.g. any zero padding specified
is padding that's entirely dedicated to the value being printed, not any pretty-printing
that also gets tacked on).

src/core/arm/dynarmic/arm_dynarmic.cpp

@@ -55,7 +55,7 @@ public:
     }
 
     void InterpreterFallback(u64 pc, size_t num_instructions) override {
-        NGLOG_INFO(Core_ARM, "Unicorn fallback @ {:#X} for {} instructions (instr = {:08X})", pc,
+        NGLOG_INFO(Core_ARM, "Unicorn fallback @ 0x{:X} for {} instructions (instr = {:08X})", pc,
                    num_instructions, MemoryReadCode(pc));
 
         ARM_Interface::ThreadContext ctx;