info: pcee2 and nuance are no longer experimental (#2035)

Author: WizzardSK

dist/info/nuance_libretro.info

@@ -29,7 +29,7 @@ libretro_saves = "false"
 core_options = "false"
 core_options_version = "null"
 load_subsystem = "false"
-is_experimental = "true"
+is_experimental = "false"
 
 # Firmware / BIOS
 firmware_count = 3

dist/info/pcee2_libretro.info

@@ -28,7 +28,7 @@ load_subsystem = "false"
 hw_render = "false"
 needs_fullpath = "true"
 disk_control = "false"
-is_experimental = "true"
+is_experimental = "false"
 
 # Firmware / BIOS
 firmware_count = 2