Remove redundant spaces in CMakeLists.txt (pytorch#126042)

Fixes pytorch#126023

```diff
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 79db67e735..924721d2e6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -281,8 +281,8 @@ if(NOT DEFINED USE_VULKAN)
 endif()

 option(USE_SLEEF_FOR_ARM_VEC256 "Use sleef for arm" OFF)
-option(USE_SOURCE_DEBUG_ON_MOBILE "Enable " ON)
-option(USE_LITE_INTERPRETER_PROFILER "Enable " ON)
+option(USE_SOURCE_DEBUG_ON_MOBILE "Enable" ON)
+option(USE_LITE_INTERPRETER_PROFILER "Enable" ON)
 option(USE_VULKAN_FP16_INFERENCE "Vulkan - Use fp16 inference" OFF)
 option(USE_VULKAN_RELAXED_PRECISION "Vulkan - Use relaxed precision math in the kernels (mediump)" OFF)
 # option USE_XNNPACK: try to enable xnnpack by default.
```

Pull Request resolved: pytorch#126042
Approved by: https://github.com/r-barnes

CMakeLists.txt

@@ -277,8 +277,8 @@ if(NOT DEFINED USE_VULKAN)
 endif()
 
 option(USE_SLEEF_FOR_ARM_VEC256 "Use sleef for arm" OFF)
-option(USE_SOURCE_DEBUG_ON_MOBILE "Enable " ON)
-option(USE_LITE_INTERPRETER_PROFILER "Enable " ON)
+option(USE_SOURCE_DEBUG_ON_MOBILE "Enable" ON)
+option(USE_LITE_INTERPRETER_PROFILER "Enable" ON)
 option(USE_VULKAN_FP16_INFERENCE "Vulkan - Use fp16 inference" OFF)
 option(USE_VULKAN_RELAXED_PRECISION "Vulkan - Use relaxed precision math in the kernels (mediump)" OFF)
 # option USE_XNNPACK: try to enable xnnpack by default.