gl_shader_cache: Add missing new-line on emitted GLSL

Add missing new-line. This caused shaders using local memory and shared
memory to inject a preprocessor GLSL line after an expression (resulting
in invalid code).

It looked like this:
shared uint smem[8];#define LOCAL_MEMORY_SIZE 16

It should look like this (addressed by this commit):
shared uint smem[8];
\#define LOCAL_MEMORY_SIZE 16

src/video_core/renderer_opengl/gl_shader_cache.cpp

@@ -281,11 +281,11 @@ CachedProgram BuildShader(const Device& device, u64 unique_identifier, ShaderTyp
         if (variant.shared_memory_size > 0) {
             // TODO(Rodrigo): We should divide by four here, but having a larger shared memory pool
             // avoids out of bound stores. Find out why shared memory size is being invalid.
-            source += fmt::format("shared uint smem[{}];", variant.shared_memory_size);
+            source += fmt::format("shared uint smem[{}];\n", variant.shared_memory_size);
         }
 
         if (variant.local_memory_size > 0) {
-            source += fmt::format("#define LOCAL_MEMORY_SIZE {}",
+            source += fmt::format("#define LOCAL_MEMORY_SIZE {}\n",
                                   Common::AlignUp(variant.local_memory_size, 4) / 4);
         }
     }