update test/reads_*.fastq.gz such that .1 and .2 are removed from reads ids

[ndaniel]

Making the test FASTQ file more compliant with aligners by changing slightly the reads ids such that paired reads have the same read id. This is done by removing the .1 from the end of reads ids in reads_1.fastq and the same for .2 in reads_2.fastq. The sequences and qualities of reads have not been modified.