Fix millis on the emulator incorrectly converting the microseconds (#315)

* Fix millis incorrectly converting the microseconds

* clang-format

Author: MaartenS11

src/Primitives/emulated.cpp

@@ -246,9 +246,9 @@ def_prim(abort, NoneToNoneU32) {
 }
 
 def_prim(millis, NoneToOneU64) {
-    struct timeval tv{};
+    timeval tv{};
     gettimeofday(&tv, nullptr);
-    unsigned long millis = 1000 * tv.tv_sec + tv.tv_usec;
+    const uint64_t millis = 1000 * tv.tv_sec + tv.tv_usec / 1000;
     pushUInt64(millis);
     return true;
 }