remove superflous when true block, retained from when VMTests wasn't passing

tests/all_tests.nim

@@ -5,12 +5,11 @@
 #  * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
-when true:
-  import  ./test_code_stream,
-          ./test_gas_meter,
-          ./test_memory,
-          ./test_stack,
-          ./test_opcode,
-          ./test_storage_backends,
-          ./test_genesis,
-          ./test_vm_json
+import  ./test_code_stream,
+        ./test_gas_meter,
+        ./test_memory,
+        ./test_stack,
+        ./test_opcode,
+        ./test_storage_backends,
+        ./test_genesis,
+        ./test_vm_json