[fenix] For https://github.com/mozilla-mobile/fenix/issues/23374 - Update Icon Disabled colors to match design system

app/src/main/java/org/mozilla/fenix/theme/FirefoxTheme.kt

@@ -71,7 +71,7 @@ private val darkColorPalette = FirefoxColors(
     iconPrimaryInactive = PhotonColors.LightGrey05A60,
     iconSecondary = PhotonColors.LightGrey40,
     iconActive = PhotonColors.Violet40,
-    iconDisabled = PhotonColors.LightGrey70,
+    iconDisabled = PhotonColors.LightGrey05A40,
     iconInverted = PhotonColors.White,
     iconNotice = PhotonColors.Blue30,
     iconButton = PhotonColors.LightGrey05,
@@ -122,7 +122,7 @@ private val lightColorPalette = FirefoxColors(
     iconPrimaryInactive = PhotonColors.DarkGrey90A60,
     iconSecondary = PhotonColors.DarkGrey05,
     iconActive = PhotonColors.Ink20,
-    iconDisabled = PhotonColors.LightGrey70,
+    iconDisabled = PhotonColors.DarkGrey90A40,
     iconInverted = PhotonColors.White,
     iconNotice = PhotonColors.Blue30,
     iconButton = PhotonColors.Ink20,

app/src/main/res/values-night/colors.xml

@@ -70,7 +70,7 @@
     <!-- Active tab -->
     <color name="fx_mobile_icon_color_active">@color/photonViolet40</color>
     <!-- Disabled icon -->
-    <color name="fx_mobile_icon_color_disabled" tools:ignore="UnusedResources">@color/photonLightGrey70</color>
+    <color name="fx_mobile_icon_color_disabled" tools:ignore="UnusedResources">@color/photonLightGrey05A40</color>
     <!-- Icon inverted (on color) -->
     <color name="fx_mobile_icon_color_inverted" tools:ignore="UnusedResources">@color/photonWhite</color>
     <!-- Information -->

app/src/main/res/values/colors.xml

@@ -70,7 +70,7 @@
     <!-- Active tab -->
     <color name="fx_mobile_icon_color_active">@color/photonInk20</color>
     <!-- Disabled icon -->
-    <color name="fx_mobile_icon_color_disabled" tools:ignore="UnusedResources">@color/photonLightGrey70</color>
+    <color name="fx_mobile_icon_color_disabled" tools:ignore="UnusedResources">@color/photonDarkGrey90A40</color>
     <!-- Icon inverted (on color) -->
     <color name="fx_mobile_icon_color_inverted" tools:ignore="UnusedResources">@color/photonWhite</color>
     <!-- Information -->