Fix Drive-By softlock

If the player enters the very first marker too quickly (within 11 seconds) the mission variables aren't properly updated and the mission softlocks at the Pay N Spray section.
A casual player shouldn't ever experience this because the drive towards the marker takes around 30 seconds, if not more.

src/gtasa/GameHandler.h

@@ -153,6 +153,12 @@ class GameHandler
                    Hooked_RemoveCJFromCarBeforeDeletion, void (CVehicle *),
                    0x467B3C);
 
+        // Fix Drive-By mission flags not updating properly if player is too
+        // fast for the first marker
+        HOOK_METHOD_ARGS (GlobalHooksInstance::Get (),
+                          Hooked_FixDriveBySpeedSoftlock,
+                          char *(CRunningScript *, int), 0x46665C);
+
         // Hook OPCodes 500-599
         HOOK_METHOD_ARGS (GlobalHooksInstance::Get (), Hooked_OpCodes_500_599,
                           char (CRunningScript *, int), 0x47E090);
@@ -433,6 +439,22 @@ class GameHandler
         cb ();
     }
 
+    static char *
+    Hooked_FixDriveBySpeedSoftlock (auto &&cb, CRunningScript *script,
+                                    int count)
+    {
+        int offset = script->m_pCurrentIP - script->m_pBaseIP - 2;
+
+        char *result = cb ();
+
+        if (offset == 18096 && *result < 2)
+        {
+            *result = 2;
+        }
+
+        return result;
+    }
+
     static char
     Hooked_OpCodes_500_599 (auto &&cb, CRunningScript *script, int opcode)
     {