PreferenceGroup: Reduce heading prominence

lawnchair/src/ch/deletescape/lawnchair/compose/ui/preferences/PreferenceGroup.kt

@@ -1,10 +1,9 @@
 package ch.deletescape.lawnchair.compose.ui.preferences
 
 import androidx.compose.foundation.layout.*
-import androidx.compose.material.Divider
-import androidx.compose.material.MaterialTheme
-import androidx.compose.material.Text
+import androidx.compose.material.*
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
@@ -22,11 +21,15 @@ fun PreferenceGroup(heading: String? = null, showDivider: Boolean = false, conte
                     .padding(start = 16.dp, end = 16.dp)
                     .fillMaxWidth()
             ) {
-                Text(
-                    text = it.toUpperCase(Locale.ROOT),
-                    style = MaterialTheme.typography.overline,
-                    color = MaterialTheme.colors.primary
-                )
+                CompositionLocalProvider(
+                    LocalContentAlpha provides ContentAlpha.medium,
+                    LocalContentColor provides MaterialTheme.colors.onBackground
+                ) {
+                    Text(
+                        text = it.toUpperCase(Locale.ROOT),
+                        style = MaterialTheme.typography.overline
+                    )
+                }
             }
         }
         content()