clang-format adds spaces around -> when emitting a signal

When emitting the signal of a QObject returned by a function, clang-format adds spaces around ->

// We have the following function:
MyObject *getObject();

// With clang-format 17 and before
emit getObject()->mySignal();
Q_EMIT getObject()->mySignal();

// With clang-format 18
emit getObject() -> mySignal();
Q_EMIT getObject() -> mySignal();

clang-format 19+ has the same behavior than clang-format 18,
but setting StatementAttributeLikeMacros: [emit, Q_EMIT] restores the old behavior.

StatementAttributeLikeMacros with clang-format 18 does not have any effect on this issue.

Given that it is an upstream bug, the only required fixes would be to:

• not use clang-format 18
• add emit to StatementAttributeLikeMacros in Qt built-in style, as only Q_EMIT is set for now.