Examples: Clean up. (#27321)

examples/jsm/shaders/GTAOShader.js

@@ -80,7 +80,7 @@ const GTAOShader = {
 
 	fragmentShader: /* glsl */`
 		varying vec2 vUv;
-		uniform sampler2D tNormal;
+		uniform highp sampler2D tNormal;
 		uniform highp sampler2D tDepth;
 		uniform sampler2D tNoise;
 		uniform vec2 resolution;

examples/jsm/shaders/SAOShader.js

@@ -58,7 +58,7 @@ const SAOShader = {
 		#endif
 
 		uniform highp sampler2D tDepth;
-		uniform sampler2D tNormal;
+		uniform highp sampler2D tNormal;
 
 		uniform float cameraNear;
 		uniform float cameraFar;

examples/jsm/shaders/SSAOShader.js

@@ -49,7 +49,7 @@ const SSAOShader = {
 		}`,
 
 	fragmentShader: /* glsl */`
-		uniform sampler2D tNormal;
+		uniform highp sampler2D tNormal;
 		uniform highp sampler2D tDepth;
 		uniform sampler2D tNoise;