Fix SparkR install.spark function

$ R

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> library(SparkR)

Attaching package: ‘SparkR’

The following objects are masked from ‘package:stats’:

    cov, filter, lag, na.omit, predict, sd, var, window

The following objects are masked from ‘package:base’:

    as.data.frame, colnames, colnames<-, drop, endsWith, intersect,
    rank, rbind, sample, startsWith, subset, summary, transform, union

> install.spark()
Spark not found in the cache directory. Installation will start.
MirrorUrl not provided.
Looking for preferred site from apache website...
Preferred mirror site found: https://dlcdn.apache.org/spark
Downloading spark-3.3.2 for Hadoop 2.7 from:
- https://dlcdn.apache.org/spark/spark-3.3.2/spark-3.3.2-bin-hadoop2.7.tgz
trying URL 'https://dlcdn.apache.org/spark/spark-3.3.2/spark-3.3.2-bin-hadoop2.7.tgz'
simpleWarning in download.file(remotePath, localPath): downloaded length 0 != reported length 196