CMake: campbell already added default build type as release a few hours

earlier in a different way, missed that, so reverting my change.

CMakeLists.txt

@@ -53,11 +53,6 @@ if(NOT EXECUTABLE_OUTPUT_PATH)
 	set(FIRST_RUN "TRUE")
 endif()
 
-# set default build type to Release
-if(NOT CMAKE_BUILD_TYPE)
-	set(CMAKE_BUILD_TYPE "Release")
-endif()
-
 # this starts out unset
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/build_files/cmake/Modules")