video_core/memory_manager: Mark IsBlockContinuous() as a const member function

Corrects the typo in its name and marks the function as a const member
function, given it doesn't actually modify memory manager state.

src/video_core/memory_manager.cpp

@@ -201,11 +201,11 @@ const u8* MemoryManager::GetPointer(GPUVAddr addr) const {
     return {};
 }
 
-bool MemoryManager::IsBlockContinous(const GPUVAddr start, const std::size_t size) {
+bool MemoryManager::IsBlockContinuous(const GPUVAddr start, const std::size_t size) const {
     const GPUVAddr end = start + size;
     const auto host_ptr_start = reinterpret_cast<std::uintptr_t>(GetPointer(start));
     const auto host_ptr_end = reinterpret_cast<std::uintptr_t>(GetPointer(end));
-    const std::size_t range = static_cast<std::size_t>(host_ptr_end - host_ptr_start);
+    const auto range = static_cast<std::size_t>(host_ptr_end - host_ptr_start);
     return range == size;
 }
 

src/video_core/memory_manager.h

@@ -66,8 +66,8 @@ public:
     u8* GetPointer(GPUVAddr addr);
     const u8* GetPointer(GPUVAddr addr) const;
 
-    // Returns true if the block is continuous in host memory, false otherwise
-    bool IsBlockContinous(GPUVAddr start, std::size_t size);
+    /// Returns true if the block is continuous in host memory, false otherwise
+    bool IsBlockContinuous(GPUVAddr start, std::size_t size) const;
 
     /**
      * ReadBlock and WriteBlock are full read and write operations over virtual