common.xml: remove display="bitmask" from many fields

[peterbarker]

this information has been moved to the enumeration definition

this is no compiler output change for ArduPilot.

This is a stricter version of #385 which doesn't contain stray changes to the XML.

I've verified that all of the enumerations referenced on these lines are marked as bitmasks.

I've looked at the difference in generated .h and there's no difference to speak of (just the XML hashes)

pymavlink generation also shows not output change:

pbarker@crun:~/rc/pymavlink(master)$ diff -u /tmp/x.py /tmp/y.py 
--- /tmp/x.py	2025-12-08 17:25:29.533130958 +1100
+++ /tmp/y.py	2025-12-08 17:21:34.961428630 +1100
@@ -16,7 +16,7 @@
 from typing import Any, Callable, Dict, Iterable, List, Mapping, Optional, Sequence, Tuple, Type, Union
 
 WIRE_PROTOCOL_VERSION = "1.0"
-DIALECT = "x"
+DIALECT = "y"
 
 PROTOCOL_MARKER_V1 = 0xFE
 PROTOCOL_MARKER_V2 = 0xFD
pbarker@crun:~/rc/pymavlink(master)$