LibUnicode: Invoke lagom_tool() with SOURCES inline

Meta/Lagom/Tools/CodeGenerators/LibUnicode/CMakeLists.txt

@@ -1,17 +1,3 @@
-set(SOURCES
-    GenerateUnicodeData.cpp
-)
-
-lagom_tool(GenerateUnicodeData)
-
-set(SOURCES
-    GenerateUnicodeLocale.cpp
-)
-
-lagom_tool(GenerateUnicodeLocale)
-
-set(SOURCES
-    GenerateUnicodeNumberFormat.cpp
-)
-
-lagom_tool(GenerateUnicodeNumberFormat)
+lagom_tool(GenerateUnicodeData SOURCES GenerateUnicodeData.cpp)
+lagom_tool(GenerateUnicodeLocale SOURCES GenerateUnicodeLocale.cpp)
+lagom_tool(GenerateUnicodeNumberFormat SOURCES GenerateUnicodeNumberFormat.cpp)