Move DispatchersModule to /di/modules (2/3)

Move DispatchersModule to /di/modules so that it's easier to find all
the modules which provide instances of different classes.

Test: Build success
Bug: 315709229
Flag: None
Change-Id: I5540a2b88bda0b2ef003c549df3f6d2c9fedae2e
diff --git a/src/com/android/customization/module/ThemePickerInjector.kt b/src/com/android/customization/module/ThemePickerInjector.kt
index 0ae9600..f22e562 100644
--- a/src/com/android/customization/module/ThemePickerInjector.kt
+++ b/src/com/android/customization/module/ThemePickerInjector.kt
@@ -68,8 +68,6 @@
 import com.android.systemui.shared.customization.data.content.CustomizationProviderClient
 import com.android.systemui.shared.customization.data.content.CustomizationProviderClientImpl
 import com.android.wallpaper.config.BaseFlags
-import com.android.wallpaper.dispatchers.BackgroundDispatcher
-import com.android.wallpaper.dispatchers.MainDispatcher
 import com.android.wallpaper.module.CustomizationSections
 import com.android.wallpaper.module.FragmentFactory
 import com.android.wallpaper.module.WallpaperPicker2Injector
@@ -78,6 +76,8 @@
 import com.android.wallpaper.picker.customization.data.repository.WallpaperColorsRepository
 import com.android.wallpaper.picker.customization.data.repository.WallpaperRepository
 import com.android.wallpaper.picker.customization.domain.interactor.WallpaperInteractor
+import com.android.wallpaper.picker.di.modules.BackgroundDispatcher
+import com.android.wallpaper.picker.di.modules.MainDispatcher
 import com.android.wallpaper.picker.undo.domain.interactor.SnapshotRestorer
 import com.android.wallpaper.util.ScreenSizeCalculator
 import javax.inject.Inject