Fixed banner with the help of AI

vars/printBanner.groovy

@@ -1,6 +1,8 @@
-void call(stepName) {
-    def bannerWidth = stepName.length() + 6
-    def banner = "+${'-'.multiply(bannerWidth)}+"
-    def stepBanner = "|  $stepName  |"
+void call(String stepName) {
+    stepCorner = '+'
+    stepBanner = "|   $stepName   |"
+    bannerWidth = stepBanner.length() - 2
+    banner = stepCorder + ('=' * bannerWidth) + stepCorner
+
     echo "$banner\n$stepBanner\n$banner"
 }