opacitynode: switch view to percent rather than as a normal number

app/shaders/opacity.frag

@@ -6,5 +6,5 @@ uniform sampler2D tex_in;
 uniform float opacity_in;
 
 void main(void) {
-  gl_FragColor = texture2D(tex_in, ove_texcoord) * (opacity_in * 0.01);
+  gl_FragColor = texture2D(tex_in, ove_texcoord) * (opacity_in);
 }

app/shaders/opacity.xml

@@ -21,8 +21,9 @@
     <param id="opacity_in" type="float">
         <name lang="en_US">Opacity</name>
         <min>0</min>
-        <max>100</max>
-        <default>100</default>
+        <max>1</max>
+        <view>percent</view>
+        <default>1</default>
     </param>
 
     <!-- Qt Resource path to fragment shader -->