chore(windows/ci): move env var up in the list to be like other files

ci/Jenkinsfile.windows

@@ -41,14 +41,15 @@ pipeline {
     MAKEFLAGS = "-j${utils.getProcCount()} V=${params.VERBOSE}"
     /* Disable colors in Nim compiler logs */
     NIMFLAGS = '--colors:off'
+    /* Explicitly set the QT version */
+    QTDIR = "/c/Qt/5.15.2/msvc2019_64"
+    PATH = "${env.QTDIR}/bin:${env.PATH}"
     /* Control output the filename */
     STATUS_CLIENT_EXE = "pkg/${utils.pkgFilename(ext: 'exe', arch: getArch())}"
     /* 7zip archive filename */
     STATUS_CLIENT_7Z = "pkg/${utils.pkgFilename(ext: '7z', arch: getArch())}"
     /* RFC 3161 timestamping URL for DigiCert */
     WINDOWS_CODESIGN_TIMESTAMP_URL = 'http://timestamp.digicert.com'
-    QTDIR = "/c/Qt/5.15.2/msvc2019_64"
-    PATH = "${env.QTDIR}/bin:${env.PATH}"
   }
 
   stages {