OptiDLSS5-UI v1.6.0

Fix doubled v-prefix in Feeder update status; bump to 1.6.0

currentVersion/latestVersion already carry GitHub's tag v-prefix, so
the status line read "vv0.15.1" instead of "v0.15.1". Found via a
live CDP-driven test of the app.

1.6.0 covers everything since 1.5.3: the DLL injector, the full
DLSS5-Feeder path for no-native-DLSS games, DLSS5-only auto-profile
forcing, and the opt-in OptiScaler FrameGen (FSRFG) toggle for D3D12
Feeder games -- all live-tested end-to-end on real games this session.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DVjvVSLcwjeDZW3EXnDezh