Fix token bug

Bug:  

code incorrectly set tokens = 0, then immediately consumed a token (setting it to -1)

Fix:

Update the last_refill timestamp after waiting (previously missing)

Correctly credit exactly 1 token after waiting the appropriate time

Then consume the token, leaving the balance at 0 (not negative)

lnbits/wallets/strike.py

@@ -1,3 +1,4 @@
+
 import asyncio
 import random
 import time
@@ -53,16 +54,21 @@ class TokenBucket:
                 self.tokens = min(self.rate, self.tokens + new_tokens)
                 self.last_refill = now
 
-            # If no tokens available, calculate wait time
+            # If no tokens available, calculate wait time and wait for a token
             if self.tokens < 1:
+                # Calculate time needed for one token
                 wait_time = (self.period / self.rate) * (1 - self.tokens)
                 await asyncio.sleep(wait_time)
-                self.tokens = 0  # Reset after waiting
                 
-            # Consume a token
+                # After waiting, update time and add one token
+                self.last_refill = time.monotonic()
+                self.tokens = 1  # We now have exactly one token available
+
+            # Consume a token (will be 0 or more after consumption)
             self.tokens -= 1
 
 
+
 class StrikeWallet(Wallet):
     """
     https://developer.strike.me/api