Fix PNG elevation decoding.

worldwind/src/jvmCommonMain/kotlin/earth/worldwind/globe/elevation/ElevationDecoder.kt

@@ -114,7 +114,7 @@ open class ElevationDecoder: Closeable {
         }
 
         // Check if scale and offset should be applied to elevation data
-        return if (tileOffset != 1.0f || tileScale != 0.0f || coverageScale != 1.0f || coverageOffset != 0.0f) {
+        return if (tileScale != 1.0f || tileOffset != 0.0f || coverageScale != 1.0f || coverageOffset != 0.0f) {
             // Apply scale and offset to INT16 values (except null data value) and return them as FLOAT32
             val pixels = FloatArray(png.imgInfo.cols * png.imgInfo.rows)
             var row = 0