obs-filters: Remove obsolete translation in expander-filter

Expander.None was never used.

plugins/obs-filters/data/locale/en-US.ini

@@ -111,7 +111,6 @@ Expander.OutputGain="Output Gain"
 Expander.Detector="Detection"
 Expander.RMS="RMS"
 Expander.Peak="Peak"
-Expander.None="None"
 Expander.Presets="Presets"
 Expander.Presets.Expander="Expander"
 Expander.Presets.Gate="Gate"

plugins/obs-filters/expander-filter.c

@@ -45,7 +45,6 @@
 #define TEXT_DETECTOR                   MT_("Expander.Detector")
 #define TEXT_PEAK                       MT_("Expander.Peak")
 #define TEXT_RMS                        MT_("Expander.RMS")
-#define TEXT_NONE                       MT_("Expander.None")
 #define TEXT_PRESETS                    MT_("Expander.Presets")
 #define TEXT_PRESETS_EXP                MT_("Expander.Presets.Expander")
 #define TEXT_PRESETS_GATE               MT_("Expander.Presets.Gate")