Make sure we continue finding random start times after reset.

boptestGymEnv.py

@@ -461,7 +461,8 @@ def find_start_time():
             return start_time
 
         # Assign random start_time if start_time is None
-        if not self.start_time:
+        if not self.start_time or self.random_start_time:
+            self.random_start_time = True
             self.start_time = find_start_time()
 
         # Initialize the building simulation