home-manager: handle `$EDITOR` containing spaces

The quoted `$EDITOR` causes errors when using values containing
arguments, eg. "code --wait". This is in contrast to the majority of
tools (git, etc.) that do support this usage.

Fixes #1496

home-manager/home-manager

@@ -165,7 +165,11 @@ function doEdit() {
 
     setConfigFile
 
-    exec "$EDITOR" "$HOME_MANAGER_CONFIG"
+    # Don't quote $EDITOR in order to support values including options, e.g.,
+    # "code --wait".
+    #
+    # shellcheck disable=2086
+    exec $EDITOR "$HOME_MANAGER_CONFIG"
 }
 
 function doBuild() {