Fetch posthook by input selector

[doublespending]

Motivation

Currently, _doPreExecHooks in contract UpgradeableModularAccount use msg.sig to get postExecHook.
However, the input parameter selector is not always equal to msg.sig. In the case of executeFromPlugin(bytes calldata data), the input parameter selector is bytes4(data[:4]) and msg.sig is IPluginExecutor.executeFromPlugin.selector.

Solution

The solution is using input parameter selector to fetch postHook instead of msg.sig.

[howydev]

hi there! good find, thank you for catching this and making this PR