retroarch: Fix ES configscript not using fixed strings in grep commands that are searching for the device name

The impact of this is that any device name that's reported with special characters from grep's default regular expression
engine would fail.  For example, "*" would be misinterpreted.  This change makes the script more aligned with other
grep commands in the file.

Author: obrie

scriptmodules/supplementary/emulationstation/configscripts/retroarch.sh

@@ -241,7 +241,7 @@ function map_retroarch_joystick() {
     declare -A hat_map=([1]="up" [2]="right" [4]="down" [8]="left")
     iniGet "input_driver"
     local input_driver="$ini_value"
-    local autoconfig_preset=$(grep -rwl "$rootdir/emulators/retroarch/autoconfig-presets/$input_driver" -e "$DEVICE_NAME" | head -1)
+    local autoconfig_preset=$(grep -rwFl "$rootdir/emulators/retroarch/autoconfig-presets/$input_driver" -e "$DEVICE_NAME" | head -1)
     for key in "${keys[@]}"; do
         case "$input_type" in
             hat)