Audio: rename Buffer::Format enum values for consistency.

It is unlikely that this will change any time soon, so just use Float
and Double instead of Float32 and Double.

src/Magnum/Audio/Buffer.cpp

@@ -37,8 +37,8 @@ Debug& operator<<(Debug& debug, const Buffer::Format value) {
         _c(Stereo8)
         _c(Stereo16)
 
-        _c(MonoFloat32)
+        _c(MonoFloat)
-        _c(StereoFloat32)
+        _c(StereoFloat)
         _c(MonoDouble)
         _c(StereoDouble)
         #undef _c

src/Magnum/Audio/Buffer.h

@@ -62,14 +62,14 @@ class Buffer {
              *
              * @requires_al_extension Extension @al_extension{EXT,float32}
              */
-            MonoFloat32 = AL_FORMAT_MONO_FLOAT32,
+            MonoFloat = AL_FORMAT_MONO_FLOAT32,
 
             /**
              * @brief 32-bit interleaved floating-point stereo
              *
              * @requires_al_extension Extension @al_extension{EXT,float32}
              */
-            StereoFloat32 = AL_FORMAT_STEREO_FLOAT32,
+            StereoFloat = AL_FORMAT_STEREO_FLOAT32,
 
             /**
              * @brief 64-bit floating-point mono