Merge #17308: nsis: Write to correct filename in first place

3b3b93174a nsis: Write to correct filename in first place (Carl Dong)

Pull request description:

  Per MarcoFalke's suggestion here https://github.com/bitcoin/bitcoin/pull/17029#discussion_r333216722

ACKs for top commit:
  MarcoFalke:
    unsigned ACK 3b3b93174a, makes sense to name it that way because it will raise the "unsinged" error in Windows

Tree-SHA512: da72aae438505e162d0b3cd27d873b7ad8176178bb459a738e61b6e2ad0fa739d905b3109fab641bb1a3950fe59ad526c5568d12cf48a305166cdb7db6686543

contrib/gitian-descriptors/gitian-win.yml

@@ -145,10 +145,7 @@ script: |
     make ${MAKEOPTS} -C src check-security
     make deploy
     make install DESTDIR=${INSTALLPATH}
-    (
-      SETUP_EXE="$(basename "$(echo ./*-setup.exe)")"
-      cp -f "$SETUP_EXE" "${OUTDIR}/${SETUP_EXE/%-setup.exe/-setup-unsigned.exe}"
-    )
+    cp -f --target-directory="${OUTDIR}" ./bitcoin-*-setup-unsigned.exe
     cd installed
     mv ${DISTNAME}/bin/*.dll ${DISTNAME}/lib/
     find . -name "lib*.la" -delete