Rita should use --force-space when doing opkg updates

[jkilpatr]

Rita is a very hefty package due to large Rust binary sizes, about 10MB. On some devices with small storage (mostly linksys ea6350v3 models) the main partition doesn't have sufficient space to install an update, thus preventing the router form taking updates until it is sysupgraded.

Given that we are replacing a 10MB binary with another 10MB binary we really don't need 20MB of space to perform this upgrade. the only problem is ensuring it actually executes properly. I've had some luck doing updates by hand by moving /usr/bin/rita to tmp then running opkg install with the --force-space flag.