Replace hyphens with underscores in function names

It should fix:
/etc/bash_completion.d/slapt: line 69: `_slapt-get': not a valid identifier
Reported on LQ:
http://www.linuxquestions.org/questions/slackware-14/bash-completion-1-3-noarch-1-causes-xorg-failure-863157/

completions/slapt

@@ -1,7 +1,7 @@
 # slapt-get and slapt-src completion
 
 have slapt-get &&
-_slapt-get()
+_slapt_get()
 {
     COMPREPLY=()
     local cur prev
@@ -66,10 +66,10 @@ _slapt-get()
             return 0
             ;;
     esac
-} && complete -F _slapt-get slapt-get
+} && complete -F _slapt_get slapt-get
 
 have slapt-src &&
-_slapt-src()
+_slapt_src()
 {
     COMPREPLY=()
     local cur prev
@@ -133,4 +133,4 @@ _slapt-src()
 
     COMPREPLY=( $( sed -ne \
         "/^SLACKBUILD NAME: $cur/{s/^SLACKBUILD NAME: //;p}" "$slck_data" ) )
-} && complete -F _slapt-src slapt-src
+} && complete -F _slapt_src slapt-src