Adapt SlewRate includes to convention

src/lib/slew_rate/CMakeLists.txt

@@ -32,7 +32,8 @@
 ############################################################################
 
 px4_add_library(SlewRate
-	dummy.cpp
+	SlewRate.hpp
+	SlewRateYaw.hpp
 )
 target_include_directories(SlewRate
 	PUBLIC

src/lib/slew_rate/SlewRateTest.cpp

@@ -32,7 +32,7 @@
  ****************************************************************************/
 
 #include <gtest/gtest.h>
-#include <SlewRate.hpp>
+#include "SlewRate.hpp"
 
 TEST(SlewRateTest, SlewUpLimited)
 {

src/lib/slew_rate/SlewRateYawTest.cpp

@@ -32,7 +32,7 @@
  ****************************************************************************/
 
 #include <gtest/gtest.h>
-#include <SlewRateYaw.hpp>
+#include "SlewRateYaw.hpp"
 
 TEST(SlewRateYawTest, SlewUpLimited)
 {