cmake: make formatting of install statements follow one pattern

Change-Id: Ib7d571af629b0af78397a411b0cca409a6d218d8
diff --git a/python/transmitter/CMakeLists.txt b/python/transmitter/CMakeLists.txt
index c32d6e1..3a5bbe8 100644
--- a/python/transmitter/CMakeLists.txt
+++ b/python/transmitter/CMakeLists.txt
@@ -20,5 +20,6 @@
 GR_PYTHON_INSTALL(
     FILES
     txtime_bursts_tagger.py
-    gsm_gmsk_mod.py DESTINATION ${GR_PYTHON_DIR}/grgsm
+    gsm_gmsk_mod.py
+    DESTINATION ${GR_PYTHON_DIR}/grgsm
 )