Add Scala icon

ci/properties/scala.properties.json

@@ -1,6 +1,6 @@
 {
     "name": "Scala",
     "description": "Build and test a Scala project with SBT.",
-    "iconName": "blank",
+    "iconName": "scala",
     "categories": ["Scala", "Java"]
 }

icons/scala.svg

@@ -0,0 +1 @@
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