Regression from #71248:

I believe this pull may have caused errors on WebGL since it moves the `GLES_OVER_GL` guard. WebGL does not support texture swizzling per: https://registry.khronos.org/webgl/specs/latest/2.0/#5.19
so this is causing the following trace in Chrome:
```
WebGL: INVALID_ENUM: texParameter: invalid parameter name
```
and it quickly fills up the 256 log limit for the same message in WebGL.

This doesn't appear to be breaking anything asides from causing the numerous log messages.

_Originally posted by @jnlopar in https://github.com/godotengine/godot/issues/71248#issuecomment-1384768973_

CC @rsjtdrjgfuzkfg @clayjohn
RenderTarget *rt = render_target_owner.get_or_null(p_render_target);
	ERR_FAIL_COND(!rt);
	rt->clear_requested = false;
}
void TextureStorage::render_target_do_clear_request(RID p_render_target) {
	RenderTarget *rt = render_target_owner.get_or_null(p_render_target);
	ERR_FAIL_COND(!rt);
	if (!rt->clear_requested) {
		return;
	}
	glBindFramebuffer(GL_FRAMEBUFFER, rt->fbo);
	glClearBufferfv(GL_COLOR, 0, rt->clear_color.components);
	rt->clear_requested = false;
	glBindFramebuffer(GL_FRAMEBUFFER, system_fbo);
}
void TextureStorage::render_target_set_sdf_size_and_scale(RID p_render_target, RS::ViewportSDFOversize p_size, RS::ViewportSDFScale p_scale) {
	RenderTarget *rt = render_target_owner.get_or_null(p_render_target);
	ERR_FAIL_COND(!rt);
	if (rt->sdf_oversize == p_size && rt->sdf_scale == p_scale) {
		return;
	}
	rt->sdf_oversize = p_size;
	rt->sdf_scale = p_scale;
	_render_target_clear_sdf(rt);
}
Rect2i TextureStorage::_render_target_get_sdf_rect(const RenderTarget *rt) const {