pgo: add set -x to all PGO scripts

Without this, debugging error reports from users is going to be _very_
difficult...

pgo/full-current-session.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-set -eu
+set -eux
 
 srcdir=$(realpath "${1}")
 blddir=$(realpath "${2}")

pgo/full-headless-cage.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-set -eu
+set -eux
 
 srcdir=$(realpath "${1}")
 blddir=$(realpath "${2}")

pgo/full-headless-sway-inner.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-set -u
+set -ux
 
 srcdir=$(realpath "${1}")
 blddir=$(realpath "${2}")

pgo/full-headless-sway.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-set -eu
+set -eux
 
 srcdir=$(realpath "${1}")
 blddir=$(realpath "${2}")

pgo/full-inner.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-set -eu
+set -eux
 
 srcdir=$(realpath "${1}")
 blddir=$(realpath "${2}")
@@ -20,7 +20,7 @@ LC_CTYPE=en_US.UTF-8 "${blddir}"/foot \
         --config=/dev/null \
         --term=xterm \
         sh -c "
-          set -eu
+          set -eux
 
          '${srcdir}/scripts/generate-alt-random-writes.py' \
             ${script_options} \"${pgo_data}\"

pgo/partial.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-set -eu
+set -eux
 
 srcdir=$(realpath "${1}")
 blddir=$(realpath "${2}")

pgo/pgo.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-set -eu
+set -eux
 
 usage_and_die() {
     echo "Usage: ${0} none|partial|full-current-session|full-headless-sway|full-headless-cage|[auto] <source-dir> <build-dir> [meson options]"