SystemMenu: Add hotkeys for Demos system menu

Author: https://github.com/hughdavenport
Commit: ec253840d7
Pull-request: https://github.com/SerenityOS/serenity/pull/22560
Reviewed-by: https://github.com/ADKaster ✅

Base/res/apps/CatDog.af

@@ -1,4 +1,4 @@
 [App]
-Name=CatDog
+Name=&CatDog
 Executable=/bin/CatDog
-Category=Demos
+Category=&Demos

Base/res/apps/Eyes.af

@@ -1,4 +1,4 @@
 [App]
-Name=Eyes
+Name=&Eyes
 Executable=/bin/Eyes
-Category=Demos
+Category=&Demos

Base/res/apps/LibGfxDemo.af

@@ -1,4 +1,4 @@
 [App]
-Name=LibGfx Demo
+Name=Lib&Gfx Demo
 Executable=/bin/LibGfxDemo
-Category=Demos
+Category=&Demos

Base/res/apps/LibGfxScaleDemo.af

@@ -1,4 +1,4 @@
 [App]
-Name=LibGfx Scale Demo
+Name=LibGfx Sc&ale Demo
 Executable=/bin/LibGfxScaleDemo
-Category=Demos
+Category=&Demos

Base/res/apps/Mandelbrot.af

@@ -1,4 +1,4 @@
 [App]
-Name=Mandelbrot
+Name=&Mandelbrot
 Executable=/bin/Mandelbrot
-Category=Demos
+Category=&Demos

Base/res/apps/ModelGallery.af

@@ -1,4 +1,4 @@
 [App]
-Name=Model Gallery
+Name=M&odel Gallery
 Executable=/bin/ModelGallery
-Category=Demos
+Category=&Demos

Base/res/apps/Screensaver.af

@@ -1,4 +1,4 @@
 [App]
-Name=Screensaver
+Name=&Screensaver
 Executable=/bin/Screensaver
-Category=Demos
+Category=&Demos

Base/res/apps/WidgetGallery.af

@@ -1,4 +1,4 @@
 [App]
-Name=Widget Gallery
+Name=&Widget Gallery
 Executable=/bin/WidgetGallery
-Category=Demos
+Category=&Demos

Base/res/icons/SystemMenu.ini

@@ -1,5 +1,5 @@
 [16x16]
-Demos=/res/icons/16x16/demos.png
+&Demos=/res/icons/16x16/demos.png
 Development=/res/icons/16x16/development.png
 &Games=/res/icons/16x16/games.png
 &Games/Puzzles=/res/icons/16x16/games.png