modules/power_profiles_daemon: add custom format from config

We move to a single icon label format to save space on the bar. We
still display the profile name and the driver in the tooltip.

resources/config.jsonc

@@ -148,6 +148,17 @@
     "battery#bat2": {
         "bat": "BAT2"
     },
+    "power_profiles_daemon": {
+      "format": "{icon}",
+      "tooltip-format": "Power profile: {profile}\nDriver: {driver}",
+      "tooltip": true,
+      "format-icons": {
+        "default": "",
+        "performance": "",
+        "balanced": "",
+        "power-saver": ""
+      }
+    },
     "network": {
         // "interface": "wlp2*", // (Optional) To force the use of this interface
         "format-wifi": "{essid} ({signalStrength}%) ",