fix: do not remove sub-second amounts from source buffer

Partial cherry-pick of #6242

Increases the default required removal duration from `0.01` => `1.0`.

Closes #6240

lib/media/streaming_engine.js

@@ -2016,8 +2016,8 @@ shaka.media.StreamingEngine = class {
     const bufferedBehind = presentationTime - startTime;
 
     const overflow = bufferedBehind - bufferBehind;
-    // See: https://github.com/shaka-project/shaka-player/issues/2982
-    if (overflow <= 0.01) {
+    // See: https://github.com/shaka-project/shaka-player/issues/6240
+    if (overflow <= 1) {
       shaka.log.v2(logPrefix,
           'buffer behind okay:',
           'presentationTime=' + presentationTime,