WebGLProgram: Fix define.

Author: Mugen87

src/renderers/webgl/WebGLProgram.js

@@ -540,7 +540,7 @@ function WebGLProgram( renderer, cacheKey, parameters, bindingStates ) {
 
 			'#endif',
 
-			'#if ( defined( USE_MORPHTARGETS ) && ! defined( MORPH_TEXTURE ) )',
+			'#if ( defined( USE_MORPHTARGETS ) && ! defined( MORPHTARGETS_TEXTURE ) )',
 
 			'	attribute vec3 morphTarget0;',
 			'	attribute vec3 morphTarget1;',