fix: remove remaining fizzbuzz test file from practice-tdd PR

Author: rahanasuleiman8-ship-it

test-driven-development/fizzbuzz.js

@@ -0,0 +1,10 @@
+function fizzbuzz(number){
+  if (number % 3 === 0 && number % 5 === 0){
+    return "fizzbuzz";
+  } else if (number % 5 === 0){
+    return "buzz";
+  } else if (number % 3 === 0){
+    return "fizz";
+  }
+  return number.toString();
+};