Revert "fix base64: invalid input"

This reverts commit de9cf7f.

`-i` is necessary only because of the line endings of the certificate

Author: umbynos

.github/workflows/release.yml

@@ -143,7 +143,7 @@ jobs:
         run: echo "${{ secrets.INSTALLER_LICENSE }}" > /tmp/license.xml
 
       - name: Save Win signing certificate to file
-        run: echo "${{ secrets.INSTALLER_CERT_WINDOWS_PFX }}" | base64 -di  > /tmp/ArduinoCerts2020.pfx
+        run: echo "${{ secrets.INSTALLER_CERT_WINDOWS_PFX }}" | base64 --decode  > /tmp/ArduinoCerts2020.pfx
         if: matrix.operating-system == 'windows-latest'
 
         # win(edge),mac(safari) -> CERT_INSTALL and win,mac:(ff,chrome) -> CHOICE_CERT_INSTALL