sbopkg, slapt-{get,src}: expand tilde in config file name

This fixes following [[ -r "$config" ]] when file name begins with ~.

completions/sbopkg

@@ -40,6 +40,7 @@ _sbopkg()
     for (( i=${#words[@]}-1; i>0; i-- )); do
         if [[ "${words[i]}" == -f ]]; then
             config="${words[i+1]}"
+            __expand_tilde_by_ref config
             break
         fi
     done

completions/slapt-get

@@ -45,6 +45,7 @@ _slapt_get()
     for (( i=${#words[@]}-1; i>0; i-- )); do
         if [[ ${words[i]} == -@(c|-config) ]]; then
             config="${words[i+1]}"
+            __expand_tilde_by_ref config
             break
         fi
     done

completions/slapt-src

@@ -41,6 +41,7 @@ _slapt_src()
     for (( i=${#words[@]}-1; i>0; i-- )); do
         if [[ ${words[i]} == -@(c|-config) ]]; then
             config="${words[i+1]}"
+            __expand_tilde_by_ref config
             break
         fi
     done