dotfiles/zshrc: only use some opts on dev hosts

Only use the Node.js and rsync variables on dev hosts.

dotfiles/zshrc

@@ -50,7 +50,6 @@ if [[ "$OSTYPE" =~ ^linux.*$ ]]; then
     # 2022-12-26: use Vulkan renderer in Sway
     # 2023-01-03: a bit buggy on older Intel, especially in Thunderbird (even on new Intel)
     #export WLR_RENDERER=vulkan
-    {%@@ endif @@%}
 
     # 2023-02-05: tell pip/poetry not to probe for keyrings. I'm not publishing
     # packages to pypi.org and the popup during pip/poetry install is annoying.
@@ -66,6 +65,7 @@ if [[ "$OSTYPE" =~ ^linux.*$ ]]; then
     # For rsync breaking change in arg parsing since 2022
     # See: https://github.com/bit-team/backintime/issues/1247
     export RSYNC_OLD_ARGS=1
+    {%@@ endif @@%}
 fi
 
 # Enable zsh completions for rtx version manager