Remove gang_count_plural_suffix and set audio channel to mono

ESPHome/TX-Ultimate-Easy-ESPHome_standard_hw_audio.yaml

@@ -11,6 +11,9 @@
 ##### - For normal system use, modifications to this file are NOT required.                    #####
 ####################################################################################################
 ---
+substitutions:
+  SWITCH_AUDIO_AMPLIFIER_RESTORE_MODE: RESTORE_DEFAULT_ON
+
 esphome:
   platformio_options:
     build_flags:
@@ -35,13 +38,13 @@ script:
           ESP_LOGCONFIG(ESPHOME_PROJECT_NAME, "  - Standard - Hardware - Audio");
 
 switch:
-  - id: sw_enable_audio
-    name: Enable Audio
+  - id: sw_audio_amplifier
+    name: Audio Amplifier
     platform: gpio
     pin:
       number: GPIO26
-      inverted: true
-    restore_mode: RESTORE_DEFAULT_ON
+      inverted: false
+    restore_mode: ${SWITCH_AUDIO_AMPLIFIER_RESTORE_MODE}
     internal: true
     entity_category: config
 ...