Fix typographical error in test setup

Author: eszmw

SoftwareTests/PreFiles/PreForwardKinematics.m

@@ -6,7 +6,7 @@
 
 if releaseInfo.Release == "R2025b"
     open_system = @(str)MyOpen(str);
-    sim = @(str,str1,num)MySim(str,str2,num);
+    sim = @(str,str1,num)MySim(str,str1,num);
 end
 
 function MyOpen(str)

SoftwareTests/PreFiles/PreForwardKinematicsSoln.m

@@ -6,7 +6,7 @@
 
 if releaseInfo.Release == "R2025b"
     open_system = @(str)MyOpen(str);
-    sim = @(str,str1,num)MySim(str,str2,num);
+    sim = @(str,str1,num)MySim(str,str1,num);
 end
 
 function MyOpen(str)