Fix wrong variables on root group

Author: simonoakesepimorphics

binary-array-ld-netcdf/src/main/kotlin/net/bald/netcdf/NetCdfBinaryArray.kt

@@ -15,7 +15,7 @@ class NetCdfBinaryArray(
     override val uri: String,
     private val file: NetcdfFile
 ): BinaryArray, Closeable {
-    override val root: Container get() = NetCdfContainer(file)
+    override val root: Container get() = NetCdfContainer(file.rootGroup)
 
     override fun close() {
         file.close()

binary-array-ld-netcdf/src/main/kotlin/net/bald/netcdf/NetCdfContainer.kt

@@ -2,15 +2,15 @@ package net.bald.netcdf
 
 import net.bald.Container
 import net.bald.Var
-import ucar.nc2.NetcdfFile
+import ucar.nc2.Group
 
 /**
  * NetCDF implementation of [Container].
  */
 class NetCdfContainer(
-    private val file: NetcdfFile
+    private val group: Group
 ): Container {
     override fun vars(): Sequence<Var> {
-        return file.variables.asSequence().map(::NetCdfVar)
+        return group.variables.asSequence().map(::NetCdfVar)
     }
 }