fix(custom-text): Reset long custom text progress to start of word (@Leonabcd123) (monkeytypegame#7213)

### Description

Check if the user bailed out mid word, if so decrease `historyLength` by
1 to reset to the start of the current word instead of the start of the
next word.

Author: Leonabcd123

frontend/src/ts/test/test-logic.ts

@@ -1084,7 +1084,16 @@ export async function finish(difficultyFailed = false): Promise<void> {
     ) {
       // They bailed out
 
-      const historyLength = TestInput.input.getHistory()?.length;
+      const history = TestInput.input.getHistory();
+      let historyLength = history?.length;
+      const wordIndex = historyLength - 1;
+
+      const lastWordInputLength = history[wordIndex]?.length ?? 0;
+
+      if (lastWordInputLength < TestWords.words.get(wordIndex).length) {
+        historyLength--;
+      }
+
       const newProgress =
         CustomText.getCustomTextLongProgress(customTextName) + historyLength;
       CustomText.setCustomTextLongProgress(customTextName, newProgress);