[settings,qt] merge of "disable controller applet" toggle with "controller applet mode" picker (#4498)

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-------------------
Small good simplification to nuke a toggle which costed me almost an entire day of work when fixing controller applet issues:

There were two settings related to Controller applet:
-"disable controller applet", which is a boolean toggle;
-"controller configuration" applet mode, which is a "Real"/"Custom" picker;

All i did was to nuke the toggle and add a third option "Disabled" to the picker.
Users which used the disable toggle will have to pick Disabled;
Real/Custom settings wont be affected since their indexes remains.
All options tested against diablo 3. All working as intended.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4498
Reviewed-by: lizzie <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/common/settings_enums.h

@@ -150,7 +150,7 @@ ENUM(ScalingFilter, NearestNeighbor, Bilinear, Bicubic, Gaussian, Lanczos, Scale
 ENUM(AntiAliasing, None, Fxaa, Smaa);
 ENUM(AspectRatio, R16_9, R4_3, R21_9, R16_10, Stretch);
 ENUM(ConsoleMode, Handheld, Docked);
-ENUM(AppletMode, HLE, LLE);
+ENUM(AppletMode, HLE, LLE, Disabled);
 ENUM(SpirvOptimizeMode, Never, OnLoad, Always);
 ENUM(GpuClock, Normal, Boost, Overclock)
 ENUM(GpuUnswizzleSize, VerySmall, Small, Normal, Large, VeryLarge)