Fix FLAMESHOT_DEBUG_CAPTURE cmake option (#1888)

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

src/CMakeLists.txt

@@ -223,9 +223,8 @@ target_compile_definitions(flameshot PRIVATE IMGUR_CLIENT_ID="313baf0c7b4d3ff")
 #target_compile_definitions(flameshot PRIVATE QAPPLICATION_CLASS=QApplication)
 target_compile_definitions(flameshot PRIVATE FLAMESHOT_APP_VERSION_URL="${GIT_API_URL}")
 # Enable easier debugging of screenshot capture mode
-if (DEFINED FLAMESHOT_DEBUG_CAPTURE)
-    target_compile_definitions(flameshot PRIVATE
-        FLAMESHOT_DEBUG_CAPTURE="${FLAMESHOT_DEBUG_CAPTURE}")
+if (FLAMESHOT_DEBUG_CAPTURE)
+    target_compile_definitions(flameshot PRIVATE FLAMESHOT_DEBUG_CAPTURE)
 endif ()
 
 foreach (FILE ${QM_FILES})