sysgroup-ui - fix route /system_groups/123/systems for UI

sysgroup-ui - updates based on comments

sysgroup-ui - fixed param checking

sysgroup-ui - rubocop fix
ui-systems - fix for params
Merge pull request #3530 from thomasmckay/sysgroup-ui

sysgroup-ui - fix route /system_groups/123/systems for UI
Merge pull request #3544 from thomasmckay/ui-systems

ui-systems - fix for params