Disable error flashes when clearing TMPDIR directory on termux app exit

Rooted users were getting `Clearing $TMPDIR directory at path "/data/data/com.termux/files/usr/tmp" failed` flash errors when they exited Termux if directories existed in TMPDIR that only had `root` user ownership, since they would fail to get cleared since clearing was being run as the termux app user instead of as the root user. Now errors will only be logged to logcat.

termux-shared/src/main/java/com/termux/shared/shell/ShellUtils.java

@@ -157,7 +157,7 @@ public static void clearTermuxTMPDIR(Context context, boolean onlyIfExists) {
  String errmsg;
  errmsg = FileUtils.clearDirectory(context, "$TMPDIR", FileUtils.getCanonicalPath(TermuxConstants.TERMUX_TMP_PREFIX_DIR_PATH, null, false));
  if (errmsg != null) {
- Logger.logErrorAndShowToast(context, errmsg);
+ Logger.logError(errmsg);
  }
  }