Sort non-compound materials by numID

reframe_tests/regression_checks/TestGeometryObject_a6a096cb/full_volume.h5

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:2b2fbdb39eb6ad15c35877be207a7a0d3f19cc22faad223d058988f788842f7b
+oid sha256:a23ccc9ed81685385ff300c0c00e70329945db364dd7eb9607a511870469c720
 size 75462640

reframe_tests/regression_checks/TestGeometryObject_a6a096cb/full_volume_materials.txt

@@ -1,8 +1,8 @@
+#material: 1 0 1 0 free_space
+#material: 4.9 0 1 0 myWater
 #material: 3 0 2 0 boxMaterial
 #material: 2 0 1.5 0 boxMaterial+boxMaterial+free_space+free_space
 #material: 1.5 0 1.25 0 boxMaterial+free_space+free_space+free_space
-#material: 1 0 1 0 free_space
 #material: 1.975 0 1 0 free_space+free_space+free_space+myWater
 #material: 2.95 0 1 0 free_space+free_space+myWater+myWater
 #material: 3.925 0 1 0 free_space+myWater+myWater+myWater
-#material: 4.9 0 1 0 myWater

reframe_tests/regression_checks/TestGeometryObject_a6a096cb/partial_volume.h5

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:6304565819cdb7c5b2af86d57bb25e3f22c92b9aae431934e2c2eca029928d59
+oid sha256:4b8f8c4979f4c82eb4be8a9a63cfaf19408b9f493d1bf3082a8226e97542ae4a
 size 4980400

reframe_tests/regression_checks/TestGeometryObject_a6a096cb/partial_volume_materials.txt

@@ -1,8 +1,8 @@
+#material: 1 0 1 0 free_space
+#material: 4.9 0 1 0 myWater
 #material: 3 0 2 0 boxMaterial
 #material: 2 0 1.5 0 boxMaterial+boxMaterial+free_space+free_space
 #material: 1.5 0 1.25 0 boxMaterial+free_space+free_space+free_space
-#material: 1 0 1 0 free_space
 #material: 1.975 0 1 0 free_space+free_space+free_space+myWater
 #material: 2.95 0 1 0 free_space+free_space+myWater+myWater
 #material: 3.925 0 1 0 free_space+myWater+myWater+myWater
-#material: 4.9 0 1 0 myWater