Revert "Work around the synapse count exceeding issue"

This reverts commit 54045ac.
Now that Issue nest#1043 is closed, there is no need for
such workaround. So, I restore the original version of
test_common_props_setting.sli, for it was cleaner.

testsuite/unittests/test_common_props_setting.sli

@@ -44,20 +44,16 @@ Author: Hans E Plesser
   { synapsedict exch known } Select
 def
 
+% prepare stdp_dopamine_synapse, which needs a
+% volume transmitter assigned to it before connecting
+/vol /volume_transmitter Create def
+/stdp_dopamine_synapse << /vt vol >> SetDefaults
+
 % first test: do everything correctly
 {
   true
   synmodels
   {
-    % Reset the kernel to work around exceeding the maximum possible
-    % number of synapse models (see Issue #1043).
-    ResetKernel
-
-    % prepare stdp_dopamine_synapse, which needs a
-    % volume transmitter assigned to it before connecting
-    /vol /volume_transmitter Create def
-    /stdp_dopamine_synapse << /vt vol >> SetDefaults
-
     /synmod Set 
     synmod << /tau_plus 5.0 /weight 2.0 >> SetDefaults 
     synmod GetDefaults [[/tau_plus /weight]] get [5.0 2.0] eq
@@ -72,19 +68,16 @@ def
   } Fold
 } assert_or_die
 
+ResetKernel
+
+% prepare stdp_dopamine_synapse, which needs a
+% volume transmitter assigned to it before connecting
+/vol /volume_transmitter Create def
+/stdp_dopamine_synapse << /vt vol >> SetDefaults
 
 % second test: set common prop on synapse
 synmodels
 {
-  % Reset the kernel to work around exceeding the maximum possible
-  % number of synapse models (see Issue #1043).
-  ResetKernel
-
-  % prepare stdp_dopamine_synapse, which needs a
-  % volume transmitter assigned to it before connecting
-  /vol /volume_transmitter Create def
-  /stdp_dopamine_synapse << /vt vol >> SetDefaults
-
   /synmod Set
   synmod GetDefaults /tau_plus get /tpref Set