Fix for iOS openGL framebuffers.

modules/juce_opengl/opengl/juce_OpenGLFrameBuffer.cpp

@@ -53,7 +53,7 @@ public:
         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
         JUCE_CHECK_OPENGL_ERROR
 
-        glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
+        glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
         JUCE_CHECK_OPENGL_ERROR
 
         context.extensions.glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, textureID, 0);