Use #!/bin/sh instead of #!/bin/bash if possible in scripts

There are many scripts in repo that use #!/bin/bash for some of them it's possible to use #!/bin/sh instead without other modifications, for example like in ./es ./wallet ./build/cordova-environment.sh

it might worth to change it for some other scripts as well if they not relaying to much on bash specific operations (see checkbashisms tool) such as in files: ./build/cordova-setup.sh ./build/build-android.sh ./build/cordova-prepare.sh ./build/build-ios.sh

melis-wallet / melis-cm-client

Use #!/bin/sh instead of #!/bin/bash if possible in scripts #6