Replace awk with sed for WSL

The WSL distribution of Debian uses mawk instead of gawk by default, which
does not support matching into an array as it is currently being done for
extracting the COM port from the device name.

This commit replaces awk by sed, which also simplifies the building of
/dev/ttySx paths.

pm3

@@ -156,10 +156,7 @@ function get_pm3_list_WSL {
     # Need to look for this first,  the call to Win32_serialport "crashes" then native bt serial port.  Don't ask why.
     #BT direct SERIAL PORTS (COM)
     if $FINDBTRFCOMM; then
-        for DEV in $(powershell.exe -command "Get-CimInstance -ClassName Win32_PnPEntity | Where-Object Caption -like 'Standard Serial over Bluetooth link (COM*' | Select Name" 2> /dev/null | awk 'match($0,/COM([0-9]+)/,m){print m[1]}'); do
-
-            DEV=${DEV/ */}
-            DEV="/dev/ttyS${DEV#COM}"
+        for DEV in $(powershell.exe -command "Get-CimInstance -ClassName Win32_PnPEntity | Where-Object Caption -like 'Standard Serial over Bluetooth link (COM*' | Select Name" 2> /dev/null | sed -nr 's#.*\bCOM([0-9]+)\b.*#/dev/ttyS\1#p'); do
             # ttyS counterpart takes some more time to appear
             if [ -e "$DEV" ]; then
                 PM3LIST+=("$DEV")
@@ -176,9 +173,7 @@ function get_pm3_list_WSL {
     fi
 
     # Normal SERIAL PORTS (COM)
-    for DEV in $(powershell.exe -command "Get-CimInstance -ClassName Win32_serialport | Where-Object PNPDeviceID -like '*VID_9AC4&PID_4B8F*' | Select DeviceID" 2>/dev/null | awk '/^COM/{print $1}'); do
-        DEV=${DEV/ */}
-        DEV="/dev/ttyS${DEV#COM}"
+    for DEV in $(powershell.exe -command "Get-CimInstance -ClassName Win32_serialport | Where-Object PNPDeviceID -like '*VID_9AC4&PID_4B8F*' | Select DeviceID" 2>/dev/null | sed -nr 's#^COM([0-9]+)\b#/dev/ttyS\1#p'); do
         # ttyS counterpart takes some more time to appear
         if [ -e "$DEV" ]; then
             PM3LIST+=("$DEV")
@@ -194,9 +189,7 @@ function get_pm3_list_WSL {
 
     #white BT dongle SERIAL PORTS (COM)
     if $FINDBTDONGLE; then
-        for DEV in $(powershell.exe -command "Get-CimInstance -ClassName Win32_serialport | Where-Object PNPDeviceID -like '*VID_10C4&PID_EA60*' | Select DeviceID" 2>/dev/null | awk '/^COM/{print $1}'); do
-            DEV=${DEV/ */}
-            DEV="/dev/ttyS${DEV#COM}"
+        for DEV in $(powershell.exe -command "Get-CimInstance -ClassName Win32_serialport | Where-Object PNPDeviceID -like '*VID_10C4&PID_EA60*' | Select DeviceID" 2>/dev/null | sed -nr 's#^COM([0-9]+)\b#/dev/ttyS\1#p'); do
             # ttyS counterpart takes some more time to appear
             if [ -e "$DEV" ]; then
                 PM3LIST+=("$DEV")