Prevent usage of hard-coded string for contentDescription, and fix existing issues.

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/components/RoomPrivacyOption.kt

@@ -58,7 +58,7 @@ fun RoomPrivacyOption(
         Icon(
             modifier = Modifier.padding(horizontal = 8.dp),
             resourceId = roomPrivacyItem.icon,
-            contentDescription = "",
+            contentDescription = null,
             tint = MaterialTheme.colorScheme.secondary,
         )
 

features/lockscreen/impl/src/main/kotlin/io/element/android/features/lockscreen/impl/unlock/PinUnlockView.kt

@@ -300,7 +300,7 @@ private fun PinUnlockHeader(
                     .size(32.dp),
                 tint = ElementTheme.colors.iconPrimary,
                 imageVector = Icons.Filled.Lock,
-                contentDescription = "",
+                contentDescription = null,
             )
         }
         Spacer(modifier = Modifier.height(16.dp))