test(nes): consolidate and simplify inline subsystem unit tests

src/system/nes/bus.zig

@@ -183,7 +183,7 @@ pub fn irqLine(self: *const Bus) bool {
     return apu_irq or cart_irq;
 }
 
-// ponytail: consolidated bus memory mirroring test suite
+// consolidated bus memory mirroring test suite
 test "bus internal RAM and CIRAM nametable mirroring" {
     var bus = Bus.init(.ntsc, null);
     bus.write(0x0005, 0x99);