fix: Fix indentation for M.clear_preview() call

Author: samiulsami

lua/copilot/suggestion/init.lua

@@ -588,7 +588,7 @@ function M.accept(modifier)
     ctx.accepted_partial = true
     ignore_next_cursor_moved = true
   else
-  M.clear_preview()
+    M.clear_preview()
     newText = suggestion.text
   end