wid: Make GATT WIDs always return same type

Some Edit MMI style WIDs are used to enter values and boolean
return would be converted to integer anyway.

Author: sjanc

autopts/wid/gatt.py

@@ -1959,7 +1959,7 @@ def hdl_wid_151(_: WIDParams):
             stack.gatt.value_len = val_len
             return f'{handle:04x}'
 
-    return False
+    return 0
 
 
 def hdl_wid_152(_: WIDParams):
@@ -2000,7 +2000,7 @@ def hdl_wid_152(_: WIDParams):
             stack.gatt.value_len = val_len
             return f'{handle:04x}'
 
-    return False
+    return 0
 
 
 def hdl_wid_154(_: WIDParams):