Update force web search icon color correctly in light mode (#6438)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/1200204095367872/task/1210861357423900?focus=true

### Description

- Sets the force web search icon to `daxColorWhite` when toggled.

### Steps to test this PR

- [x] Enable light mode
- [x] Toggle the force web search button
- [x] Verify that the icon color updates correctly

Author: joshliebe

duckchat/duckchat-impl/src/main/java/com/duckduckgo/duckchat/impl/inputscreen/ui/InputScreenFragment.kt

@@ -253,9 +253,13 @@ class InputScreenFragment : DuckDuckGoFragment(R.layout.fragment_input_screen) {
             if (it.forceWebSearchEnabled) {
                 binding.actionForceWebSearch.backgroundTintList =
                     ColorStateList.valueOf(requireContext().getColorFromAttr(com.duckduckgo.mobile.android.R.attr.daxColorButtonPrimaryContainer))
+                binding.actionForceWebSearch.imageTintList =
+                    ColorStateList.valueOf(requireContext().getColorFromAttr(com.duckduckgo.mobile.android.R.attr.daxColorWhite))
             } else {
                 binding.actionForceWebSearch.backgroundTintList =
                     ColorStateList.valueOf(requireContext().getColorFromAttr(com.duckduckgo.mobile.android.R.attr.daxColorWindow))
+                binding.actionForceWebSearch.imageTintList =
+                    ColorStateList.valueOf(requireContext().getColorFromAttr(com.duckduckgo.mobile.android.R.attr.daxColorPrimaryIcon))
             }
         }.launchIn(lifecycleScope)