cmake: make formatting of install statements follow one pattern

Change-Id: Ib7d571af629b0af78397a411b0cca409a6d218d8
diff --git a/grc/CMakeLists.txt b/grc/CMakeLists.txt
index deee6e0..173b642 100644
--- a/grc/CMakeLists.txt
+++ b/grc/CMakeLists.txt
@@ -25,6 +25,8 @@
 add_subdirectory(misc_utils)
 add_subdirectory(transmitter)
 add_subdirectory(trx)
-install(FILES
-    gsm.tree.yml DESTINATION share/gnuradio/grc/blocks
+install(
+    FILES
+    gsm.tree.yml
+    DESTINATION share/gnuradio/grc/blocks
 )