* Fix two more un-compliant PostShadow shaders

jme3-core/src/main/resources/Common/MatDefs/Shadow/PostShadow.frag

@@ -61,8 +61,8 @@ void main(){
                            projCoord0, projCoord1, projCoord2, projCoord3);
        #else 
             //spotlight
-            if(lightDot < 0){
-                outFragColor =  vec4(1.0);
+            if(lightDot < 0.0){
+                gl_FragColor = vec4(1.0);
                 return;
             }
             shadow = getSpotLightShadows(m_ShadowMap0,projCoord0);

jme3-core/src/main/resources/Common/MatDefs/Shadow/PostShadowFilter.frag

@@ -59,7 +59,7 @@ void main(){
    
      #if (!defined(POINTLIGHT) && !defined(PSSM))
           vec3 lightDir = worldPos.xyz - m_LightPos;
-          if( dot(m_LightDir,lightDir)<0){
+          if( dot(m_LightDir,lightDir) < 0.0){
             gl_FragColor = color;
             return;
           }