Move cmd start escape to end of prompt

Since the mode prompt 'appears to the left of the regular prompt', declaring that the start of the cmd causes the rest of the prompt to be part of the command.

Author: grgar

src/vs/workbench/contrib/terminal/browser/media/fish_xdg_data/fish/vendor_conf.d/shellIntegration.fish

@@ -173,11 +173,11 @@ function __init_vscode_shell_integration
 		function fish_mode_prompt
 			__vsc_fish_prompt_start
 			__vsc_fish_mode_prompt
-			__vsc_fish_cmd_start
 		end
 
 		function fish_prompt
 			__vsc_fish_prompt
+			__vsc_fish_cmd_start
 		end
 	else
 		# No fish_mode_prompt, so put everything in fish_prompt.