Update media title margin for large screens.

[kpaikena]

WHAT

Update media title margins for large screens.

WHY

To comply with large screen UI/UX guidelines.

HOW

Set margin between title and artist to 4dp for large screen and 2dp for small screen in MarqueeTextMediaDisplay, TextMediaDisplay.
Also fixed media title alignment in TextMediaDisplay, updated LoadingMediaDisplay, and added separate screenshot tests for large screen in LoadingMediaDisplayTest.

Checklist 📋

• Add explicit visibility modifier and explicit return types for public declarations
• Run spotless check
• Run tests
• Update metalava's signature text files

[yschimke]

The sorrow looks about 1px higher than the other 3, or I'm imagining it?

[yschimke]

LGTM but failing build, and some comments.

[yschimke]

com.google.android.horologist.screensizes.MediaPlayerTest > screenshot[6] FAILED
    java.lang.AssertionError at Diffing.kt:154
    
...

com.google.android.horologist.media.ui.MediaPlayerDeviceScreenTest > mediaPlayerScreen FAILED
    java.lang.AssertionError at MediaPlayerDeviceScreenTest.kt:80
    
...    

com.google.android.horologist.media.ui.MediaPlayerScreenTest > mediaPlayerScreen[6] FAILED
    java.lang.AssertionError at MediaPlayerScreenTest.kt:72

...    

com.google.android.horologist.media.ui.PodcastPlayerScreenTest > mediaPlayerScreen[2] FAILED
    java.lang.AssertionError at PodcastPlayerScreenTest.kt:69
    
...    

com.google.android.horologist.media.ui.components.MarqueeTextMediaDisplayTest > givenPaintable_thenImageIsDisplayed FAILED
    java.lang.AssertionError at MarqueeTextMediaDisplayTest.kt:54