Fix an error with the last parenthesis when printing Tensor.

src/data/Tensor.cpp

@@ -180,8 +180,8 @@ std::string Aidge::Tensor::toString() const {
             }
         }
 
-        for(int i = static_cast<int>(dim); i > 0; --i) {
-            res += std::string((dim+1)<<1,' ') + "}\n";
+        for(int i = static_cast<int>(dim); i >= 0; --i) {
+            res += std::string((i+1)<<1,' ') + "}\n";
         }
     } else {
         res += "{";