fix(safe-paste): drop set line that overwrote positional parameters

'set zle_bracketed_paste' cannot restore a zsh default: there is no
option by that name, and 'set' with a bare word assigns positional
parameters. Sourcing the plugin replaced $1 with the literal string
'zle_bracketed_paste'.

zle_bracketed_paste is an array parameter, so nothing here was setting
it either. Removing the line does not change paste behaviour.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

plugins/safe-paste/safe-paste.plugin.zsh

@@ -11,7 +11,6 @@
 # Load bracketed-paste-magic if zsh version is >= 5.1
 autoload -Uz is-at-least
 if is-at-least 5.1; then
-  set zle_bracketed_paste  # Explicitly restore this zsh default
   autoload -Uz bracketed-paste-magic
   zle -N bracketed-paste bracketed-paste-magic
   return  ### The rest of this file is NOT executed on zsh version >= 5.1 ###