Fix KMAPro/build.sh to use bash instead of sh
Fix KMAPro/build.sh to use bash instead of sh

A Linux user reports issues building KMAPro because the script uses bash syntax instead of sh.
```
while [[ $# -gt 0 ]] ; do
```

KMEA is already using `#!/bin/bash`
tavultesoft/keymanweb,tavultesoft/keymanweb