Fix hybridization seedless probability (space-wizards#25084)

Fix comparison

Hybrids (different plants being crossed) are supposed to have a high
chance of becoming seedless to balance overpowered plants.

However, a logic error in the comparison gave seedless to plants when
they were from the same seed (not hybrids) rather than the other way
around.

Reported by:    @genderGeometries

Content.Server/Botany/Systems/MutationSystem.cs

@@ -131,7 +131,7 @@ public SeedData Cross(SeedData a, SeedData b)
 
         // Hybrids have a high chance of being seedless. Balances very
         // effective hybrid crossings.
-        if (a.Name == result.Name && Random(0.7f))
+        if (a.Name != result.Name && Random(0.7f))
         {
             result.Seedless = true;
         }