Keep scanner reinit state instance-local

shared/scanner.py

@@ -61,8 +61,6 @@ RX_BUF_SIZE = const(4350)              # big enough for full v40 decoded
 #       command sleep is the known low-power state.
 class QRScanner:
 
-    needs_reinit = False
-
     def __init__(self):
 
         self.busy_scanning = False

unix/variant/sim_scanner.py

@@ -17,6 +17,7 @@ class SimulatedQRScanner(QRScanner):
         self.busy_scanning = False
         self.setup_done = True
         self.version = 'V2.3.420'
+        self.needs_reinit = False
         self.lock = asyncio.Lock()
         # returns a Q we append to as results come in
         self._q = Queue()