Fix runtime error when computing the dot product via utilities.lua (#6527)

Author: lL1l1

changelog/snippets/other.6438.md

@@ -1,4 +1,4 @@
-- (#5061, #6438) Add metamethods and utility functions for Vectors and Quaternions to simplify and clean up the code involving operations with them.
+- (#5061, #6438, #6527) Add metamethods and utility functions for Vectors and Quaternions to simplify and clean up the code involving operations with them.
   - This **removes** the file `/lua/shared/quaternions.lua`, which was added in #4768 (Mar 4, 2023), so mods that use that file will have to be updated.
   - The metamethods (defined globally in `/lua/system/utils.lua`) include:
     - Vector/Vector2 addition/subtraction/negation

lua/utilities.lua

@@ -391,7 +391,7 @@ end
 ---@param v2 Vector
 ---@return number
 function DotP(v1, v2)
-    return v1[1] * v2[1] + v1[2] * v[2] + v[3] * v[3]
+    return v1[1] * v2[1] + v1[2] * v2[2] + v1[3] * v2[3]
 end
 
 --- Returns the conjugate of a quaternion