Escape LaunchBrowser path

This also fix a bug where CTRL-C'ing redbean on Linux would kill the
browser process. It furthermore fixes a regression with the APE self
repair process that happened in a recent change.

See #158

tool/net/demo/.init.lua

@@ -1,7 +1,10 @@
 -- /.init.lua is loaded at startup in redbean's main process
-
 HidePath('/usr/share/zoneinfo/')
 
+-- open a browser tab using explorer/open/xdg-open
+-- LaunchBrowser('/tool/net/demo/index.html')
+
+-- this intercepts all requests if it's defined
 function OnHttpRequest()
    if HasParam('magic') then
       Write('<p>\r\n')
@@ -11,7 +14,7 @@ function OnHttpRequest()
       Write(EscapeHtml(LoadAsset('/.init.lua')))
       Write('</pre>\r\n')
    else
-      Route()
+      Route() -- this asks redbean to do the default thing
    end
    SetHeader('Server', 'redbean!')
 end