Revert "Fixed a typo (hmemcpy#248)" (hmemcpy#269)

This reverts commit 1b53921.

src/content/1.1/category-the-essence-of-composition.tex

@@ -195,7 +195,7 @@ \section{Composition is the Essence of Programming}
 to do. ``Take the contents of memory address x and add it to the
 contents of the register EAX.'' But even when we program in assembly,
 the instructions we give the computer are an expression of something
-more meaningful. We are solving a non-trivial problem (if it was
+more meaningful. We are solving a non-trivial problem (if it were
 trivial, we wouldn't need the help of the computer). And how do we solve
 problems? We decompose bigger problems into smaller problems. If the
 smaller problems are still too big, we decompose them further, and so