dont infer shell in benchmarks (#891)

benchmarks/basic/fnm

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-eval "$(fnm env --multi)"
+eval "$(fnm env --shell=bash)"
 fnm install v10.11.0
 fnm use v10.11.0
 node -v

benchmarks/basic/fnm_latest_master

@@ -1,6 +0,0 @@
-#!/bin/bash
-
-eval "$(~/.fnm-latest/fnm env --multi)"
-~/.fnm-latest/fnm install v10.11.0
-~/.fnm-latest/fnm use v10.11.0
-node -v

benchmarks/basic/fnm_reason

@@ -1,6 +0,0 @@
-#!/bin/bash
-
-eval "$(~/.fnm/fnm env --multi)"
-~/.fnm/fnm install v10.11.0
-~/.fnm/fnm use v10.11.0
-node -v