Fix set_colon_off() and set_decimal_off()

Need to actually clear the bits to turn them off

Author: sfe-SparkFro

qwiic_alphanumeric.py

@@ -704,7 +704,8 @@ def set_decimal_on_off(self, display_number, turn_on_decimal):
             self.decimal_on_off = self.ALPHA_DECIMAL_OFF
             dat = 0x00
 
-        self.display_RAM[adr + (display_number - 1) * 16] = self.display_RAM[adr + (display_number - 1) * 16] | dat
+        self.display_RAM[adr + (display_number - 1) * 16] &= 0xFE
+        self.display_RAM[adr + (display_number - 1) * 16] |= dat
         return self.update_display()
 
     # ---------------------------------------------------------------------------------
@@ -801,7 +802,8 @@ def set_colon_on_off(self, display_number, turn_on_colon):
             self.colon_on_off = self.ALPHA_COLON_OFF
             dat = 0x00
 
-        self.display_RAM[adr + (display_number - 1) * 16] = self.display_RAM[adr + (display_number - 1) * 16] | dat
+        self.display_RAM[adr + (display_number - 1) * 16] &= 0xFE
+        self.display_RAM[adr + (display_number - 1) * 16] |= dat
         return self.update_display()
 
     # ---------------------------------------------------------------------------------