Fixed a couple of compiler warnings in the LittleFoot runner class

modules/juce_blocks_basics/littlefoot/juce_LittleFootRunner.h

@@ -501,7 +501,7 @@ struct Runner
     /** */
     int32 setHeapInt (uint32 byteOffset, uint32 value) noexcept
     {
-        if (byteOffset < (uint32) (getProgramHeapSize() - 3))
+        if (byteOffset + 3 < getProgramHeapSize())
             Program::writeInt32 (getProgramHeapStart() + byteOffset, (int32) value);
 
         return 0;
@@ -510,7 +510,7 @@ struct Runner
     /** */
     int32 getHeapInt (uint32 byteOffset) const noexcept
     {
-        return byteOffset < getProgramHeapSize() - 3 ? Program::readInt32 (getProgramHeapStart() + byteOffset) : 0;
+        return byteOffset + 3 < getProgramHeapSize() ? Program::readInt32 (getProgramHeapStart() + byteOffset) : 0;
     }
 
     //==============================================================================