Use replace() instead of replaceAll() in SsaDecoder

We're not using regex so there's no need to use replaceAll()

PiperOrigin-RevId: 332865724

library/core/src/main/java/com/google/android/exoplayer2/text/ssa/SsaDecoder.java

@@ -263,9 +263,9 @@ public final class SsaDecoder extends SimpleSubtitleDecoder {
     SsaStyle.Overrides styleOverrides = SsaStyle.Overrides.parseFromDialogue(rawText);
     String text =
         SsaStyle.Overrides.stripStyleOverrides(rawText)
-            .replaceAll("\\\\N", "\n")
-            .replaceAll("\\\\n", "\n")
-            .replaceAll("\\\\h", "\u00A0");
+            .replace("\\N", "\n")
+            .replace("\\n", "\n")
+            .replace("\\h", "\u00A0");
     Cue cue = createCue(text, style, styleOverrides, screenWidth, screenHeight);
 
     int startTimeIndex = addCuePlacerholderByTime(startTimeUs, cueTimesUs, cues);