home: make fab size fixed

Make the shuffle FAB in the home UI a fixed size so that I don't have
to update padding based off of the screen config.

app/src/main/java/org/oxycblt/auxio/coil/AlbumArtFetcher.kt

@@ -142,7 +142,7 @@ class AlbumArtFetcher(private val context: Context) : Fetcher<Album> {
                 stream.use { stm ->
                     return SourceResult(
                         source = stm.source().buffer(),
-                        mimeType = context.contentResolver.getType(songUri),
+                        mimeType = null,
                         dataSource = DataSource.DISK
                     )
                 }

app/src/main/res/layout/fragment_home.xml

@@ -58,6 +58,7 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:src="@drawable/ic_shuffle"
+                app:fabSize="normal"
                 android:layout_margin="@dimen/spacing_medium"
                 android:contentDescription="@string/desc_shuffle_all"
                 app:tint="?attr/colorOnPrimaryContainer" />

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

@@ -36,8 +36,7 @@
         <item name="android:scrollbars">none</item>
 
         <!--
-        Temporary workaround where the material components text highlight colors are
-        hard-coded instead of following app colors
+        Work around hard-coded text highlight colors in the default Material3 theme
         -->
         <item name="android:textColorHighlight">@color/overlay_text_highlight</item>
         <item name="android:textColorHighlightInverse">@color/overlay_text_highlight_inverse</item>