Fix Control freec restart issue

[maxulysse]

• tools should have been an array - Fix and close Control-FREEC restart is flaky #225

nf-core/sarek pull request

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• This comment contains a description of changes (with reason)
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[maxulysse]

╰─≻nextflow run . -profile docker,test --step ControlFREEC --input sample.tsv 
N E X T F L O W  ~  version 20.05.0-edge
Launching `./main.nf` [happy_swirles] - revision: 3a5d3ede3a
WARN: Unknown parameter: c
Unknown tool(s), see --help for more information

╰─≻nextflow run . -profile docker,test --step ControlFREEC --input sample.tsv
N E X T F L O W  ~  version 20.05.0-edge
Launching `./main.nf` [kickass_colden] - revision: c47cacde67
----------------------------------------------------
                                        ,--./,-.
        ___     __   __   __   ___     /,-._.--~'
  |\ | |__  __ /  ` /  \ |__) |__         }  {
  | \| |       \__, \__/ |  \ |___     \`-._,-`-,
                                        `._,._,'
    ____
  .´ _  `.
 /  |\`-_ \      __        __   ___     
|   | \  `-|    |__`  /\  |__) |__  |__/
 \ |   \  /     .__| /¯¯\ |  \ |___ |  \
  `|____\´

  nf-core/sarek v3.0dev
----------------------------------------------------
...

[ggabernet]

Looks good!