Merge bitcoin#36411: ci: drop -Wno-error=maybe-uninitialized from win64 cxx flags

963f557 ci: drop -Wno-error=maybe-uninitialized from win64 flags (fanquake)

Pull request description:

  I cannot see any `maybe-uninitialized` warnings in CI logs, and this passes locally on aarch64.

ACKs for top commit:
  maflcko:
    lgtm ACK 963f557
  hebasto:
    ACK 963f557 for our current CI job.

Tree-SHA512: befff995b9dc0656eb60dd23a10dc7af27cfc9ba14b30bc90bf4892f40b5a686d8e694543b2210f76828f717cecf93d7b0154d503e124805d89d1b0914775ca2

Author: fanquake

ci/test/00_setup_env_win64.sh

@@ -17,6 +17,5 @@ printf -v BITCOIN_CONFIG "%q " \
   --preset=dev-mode \
   -DENABLE_IPC=OFF \
   -DWITH_USDT=OFF \
-  -DREDUCE_EXPORTS=ON \
-  -DCMAKE_CXX_FLAGS=-Wno-error=maybe-uninitialized
+  -DREDUCE_EXPORTS=ON
 export BITCOIN_CONFIG