icon added for gas sensor (#1981)

Author: Kunal Rai

app/src/main/java/io/pslab/adapters/SensorLoggerListAdapter.java

@@ -135,7 +135,7 @@ public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {
                 break;
             case PSLabSensor.GAS_SENSOR:
                 holder.sensor.setText(R.string.gas_sensor);
-                holder.tileIcon.setImageDrawable(context.getResources().getDrawable(R.drawable.robotic_arm));
+                holder.tileIcon.setImageDrawable(context.getResources().getDrawable(R.drawable.tile_icon_gas));
                 break;
             default:
                 break;

app/src/main/java/io/pslab/fragment/InstrumentsFragment.java

@@ -211,7 +211,7 @@ protected Void doInBackground(Void... params) {
                     getResources().getString(R.string.robotic_arm), R.drawable.robotic_arm, getResources().getString(descriptions[12])
             ));
             applicationItemList.add(new ApplicationItem(
-                    getResources().getString(R.string.gas_sensor), R.drawable.robotic_arm, getResources().getString(descriptions[13])
+                    getResources().getString(R.string.gas_sensor), R.drawable.tile_icon_gas, getResources().getString(descriptions[13])
             ));
             return null;
         }

app/src/main/res/drawable-xxhdpi/tile_icon_gas.xml

@@ -0,0 +1,11 @@
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+    android:viewportWidth="470" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
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