simplify compare to one_dyn_dim

change to shape::operator== makes it so this will work the same

src/common.cpp

@@ -81,7 +81,7 @@ std::vector<shape::dynamic_dimension> compute_broadcasted_dyn_dims(shape s0, sha
     }
     auto offset = s1.ndim() - s0.ndim();
     std::vector<shape::dynamic_dimension> out_dims(s1.dyn_dims());
-    std::vector<shape::dynamic_dimension> one_dyn_dims{{1, 1, 0}, {1, 1, 1}};
+    shape::dynamic_dimension one_dyn_dim{1, 1, 0};
     std::transform(
         s0.dyn_dims().cbegin(),
         s0.dyn_dims().cend(),
@@ -92,7 +92,7 @@ std::vector<shape::dynamic_dimension> compute_broadcasted_dyn_dims(shape s0, sha
             {
                 return a;
             }
-            else if(contains(one_dyn_dims, a) or contains(one_dyn_dims, b))
+            else if(a == one_dyn_dim or b == one_dyn_dim)
             {
                 // setting opt to 0, may need to be changed
                 return shape::dynamic_dimension{std::max(a.min, b.min), std::max(a.max, b.max), 0};